Interface wagon for work train and method for loading a work train

Abstract

Interface wagon (1; 1a, 1b) for a work train (100), configured to receive a granular product (P) loaded from a public works machine (E;Ea, Eb), comprising: - a chassis (2) comprising a frame (4) elongated along a longitudinal axis (X) of the interface wagon (1) between two longitudinal ends (5), and bogies (6) supporting said frame (4), - a first belt conveyor (10) arranged on the frame (4) of the chassis (2) and configured to circulate the granular product (P) along the longitudinal axis (X), - an inclined boom (11) arranged near one of the longitudinal ends (5) of the frame (4) and - a second belt conveyor (12) arranged on the boom (11) and configured to circulate the granular product (P) from one end (19) of the first belt conveyor (10) to the top of the boom (11) so as to allow the granular product (P) to be discharged into an adjacent wagon in which the frame (4) comprises two side walls (14) surrounding the first belt conveyor (10) and configured to receive the loading of granular product (P).;

Description

Technical field

[0001] This disclosure relates to the field of railway infrastructure maintenance and relates to equipment for loading and transporting loads during the renewal of railway tracks. It relates more particularly to an interface wagon and a work train comprising such a wagon, and also to a method for loading a granular product using such a train. Prior art

[0002] The renewal of railway tracks consists, among other things, of removing the sleepers, rails and old ballast forming three parts of the railway track, removing this used material, supplying the site with new material and laying new ballast, new sleepers and new rails.

[0003] Railway track maintenance operations are scheduled between train runs, particularly at night and on weekends. The response time is therefore necessarily limited. For example, track renewal takes place at night over a period of 8 or 9 hours, during which 6 hours of actual work are scheduled.

[0004] The old ballast to be removed forms a mass of approximately 2 t to 4 t per linear meter (lm) of railway track. The renewal of 100 m of railway track thus constitutes approximately a mass of old ballast to be removed of 2000 to 4000 t and an equivalent mass of new ballast to be transported. To transport ballast, old or new, forming an aggregate or granular product, it is not usual to use the road, because there is generally no road access or this mode of transport would be too long or not very environmentally friendly.

[0005] Thus, it is known to use work trains comprising wagons for transporting the granular product. The work train may comprise flat wagons. However, such flat wagons have a relatively low capacity, due to the low side edges, in particular a capacity of approximately 35 t for a length of 20 ml, or 1.8 t / ml.

[0006] Other types of wagons are known as gondola wagons. Gondola wagons are wagons intended for the transport of bulk goods and each have a high-sided body. Still other types of wagons specifically for transporting aggregates, such as hopper wagons named, for example, EX 80 or 100, can be used. Known wagon types with the highest transport capacities are VAD (Auto-Unloading Vehicle), with a capacity of, for example, 2.2 t / ml or 2.5 t / ml depending on the model, or MFS (MaterialFörder und Siloeinheit in German), i.e., material belt conveyor and silo unit, which have a capacity of 4.3 t / ml.

[0007] These types of wagons, gondola wagons, hopper wagons and VAD or MFS have high side edges, which explains their high capacity.

[0008] However, an additional constraint, in addition to the limited intervention time, concerns the equipment for loading or unloading wagons from or on the site. For large-scale projects, very specific machines called strippers are used to load wagons with high side edges, such as VAD or MFS for example. However, for smaller sites or for sites requiring the removal of backfill material in addition to ballast, it is not possible to have such machines, which are too expensive or unsuitable. In such cases, public works machinery is used, for example rail-road, which are excavators, also called shovels. But such machines cannot load at height in VAD or MFS, in particular because of low overhead catenaries and can therefore only load the material onto wagons with low sides such as flat wagons.

[0009] It should be added that, in the context of certain construction sites, particularly in areas with a high population density, the length of work trains is limited by the maximum length of the service tracks that can accommodate them, by the traction capacity to pull the train or by the capacity of the number of axles braked by the locomotive(s). Thus, a work train comprising flat wagons cannot be very long, for example longer than 450 ml, to compensate for the low loading capacity of the wagons.

[0010] Finally, another constraint is regulatory. Indeed, modifying equipment generally requires obtaining a new approval, which is a lengthy procedure. In particular, it is not possible to modify the height of the wagon's side walls without obtaining a new approval.

[0011] Of course, we seek to maximize the length of railway track renewed at each intervention. However, we note that the limiting factor in the renewal length is generally the logistical constraint of transporting material.

[0012] By increasing material transport capacity, it is possible to increase the linear renewal per intervention, and / or reduce the intervention time, and / or reduce the need to store wagons in the service tracks, and / or optimize production costs.

[0013] There is therefore a need for a works train that can increase material transport capacity without significantly lengthening the train and taking into account the constraints of granular product loading height and regulatory constraints. More specifically, there is a need for a wagon that allows loading by public works machinery at a low height while providing a large loading capacity. Summary

[0014] This disclosure improves the situation.

[0015] A work train interface wagon is proposed, configured to receive a granular product loaded from a public works machine, comprising: a chassis comprising an elongated frame along a longitudinal axis of the interface wagon between two longitudinal ends and bogies supporting said frame, a first belt conveyor arranged on the frame of the chassis and configured to circulate the granular product along the longitudinal axis, an inclined boom arranged near one of the longitudinal ends of the frame and a second belt conveyor arranged on the boom and configured to circulate the granular product from one end of the first belt conveyor to the top of the boom so as to allow the granular product to be discharged into an adjacent wagon.

[0016] The frame has two side walls surrounding the first belt conveyor. The side walls are configured to receive the granular product load.

[0017] This provides a wagon, which may have a low capacity, enabling the interface between a public works machine other than a stripper and a wagon which may have a greater capacity, to store and enable the transport of a greater mass of granular product.

[0018] In theory, the maximum storage capacity of the interface wagon may be less than 1 t / ml, being for example equal to approximately 1.8 t / ml, i.e. equal to the maximum storage capacity of a flat wagon. However, as indicated, the interface wagon is not intended, in practice, to store granular product, but only to transfer them to the adjacent wagon via the first and second belt conveyors. Thus, unless there is a specific storage need, there will be no storage of granular product in the interface wagon during circulation.

[0019] By "public works machinery" we mean a machine such as a shovel or excavator, particularly a rail-road machine, as distinct from a stripper. By "granular product" we mean any type of ballast or aggregate taken from an intervention zone during the renewal of railway tracks.

[0020] The loading of granular product from the machine into the interface wagon is carried out laterally via the side walls.

[0021] The features set out in the following paragraphs may, optionally, be implemented, independently of each other or in combination with each other:

[0022] The frame may have a bottom arranged above the axles and supporting the first belt conveyor.

[0023] The frame comprises, for example, two extensions arranged respectively on the two side walls, forming complementary walls and preferably arranged inclined outwards relative to the side walls. The extensions can be fixed to the chassis. The extensions can be used to guide the granular product towards the first belt conveyor.

[0024] The height of the side walls including any additional walls may be less than 1 m, in particular 0.5 m.

[0025] The loading height in such an interface wagon from the top of a rail on which the interface wagon rests, i.e. from a lower point of a wheel of the wagon in contact with the rail, is for example between 1 m and 2 m, preferably approximately 1.5 m. It is thus possible to load at a low height, with the public works machine. By "loading height" is meant the minimum height allowing the interface wagon to be loaded using public works machine.

[0026] The interface wagon may include a motor to rotate the first and second conveyor belts. Such a motor may include, for example, a thermal, electric, or hydrogen engine. The motor may also drive additional functions such as lighting, or other functions.

[0027] There are usually two bogies for the chassis, arranged under the frame, near the longitudinal ends of the frame. Each bogie generally carries two railway axles, each comprising an axle and two wheels.

[0028] The bogies are preferably motorized, in particular hydraulic or electrical. The bogie drive allows the movement of the interface wagon and possibly at least one adjacent wagon, or even several adjacent wagons, for example in the absence of a locomotive. This allows the interface wagon to move autonomously on the construction site. The interface wagon can be remotely controlled during movement by an operator. The speed of an interface wagon, the movement of which is controlled by its own motorization, is preferably relatively low, for example less than 2 km / h. The motorization is advantageously sized for such a relatively low speed.

[0029] The frame may have two buffers at its longitudinal ends. The frame may extend between the two buffers over a length of between 15 ml and 25 ml, in particular between 18 ml and 21 ml.

[0030] The flow rate of the first and second belt conveyors is, for example, between 800 m 3 / h and 1200 m 3 / h of granular product, being in particular equal to approximately 1000 m 3 / h.

[0031] According to another aspect, in combination with the above, there is provided a work train comprising an interface wagon as defined above, and a granular product transport wagon forming said adjacent wagon arranged next to said interface wagon so as to receive the discharge of granular product from the second belt conveyor of the interface wagon. The transport wagon is preferably configured to support the boom of the interface wagon.

[0032] Such a train allows the interface wagon to be loaded at a low height with a public works machine while providing a large storage capacity during transport thanks to the transport wagon. Indeed, the transport wagon advantageously has a maximum storage capacity that is higher, or even much higher, than that of the interface wagon.

[0033] The train may comprise two interface wagons arranged side by side, namely a first and a second interface wagon. In this case, the second interface wagon is adjacent to the transport wagon forming said adjacent wagon. Also in this case, the first interface wagon is adjacent to the second interface wagon opposite the transport wagon. The first interface wagon may be similar or identical to the second interface wagon, which constitutes said adjacent wagon into which the granular product is discharged from the second conveyor of the first interface wagon.

[0034] In this case, a first construction machine can load the first interface wagon and a second construction machine can load the second interface wagon. This increases the loading rate of granular products in the work train.

[0035] The second interface car advantageously comprises a boom holder configured to support the boom of the first interface car. Such a boom holder is advantageously arranged near a longitudinal end of the second interface car opposite that which is close to the boom.

[0036] Each of the first and second interface wagons preferably includes an emergency motor in the event of failure of the motor of the other of the first and second interface wagons. This allows for autonomous motorization of the entire two interface wagons, even in the event of failure of the motor of one of the two interface wagons. Such an emergency motorization may constitute a motorization of the bogies and / or of the first and second conveyors.

[0037] The work train may comprise at least two transport wagons with a large storage capacity for granular product, each having in particular a maximum storage capacity well above 1 t / ml, preferably above 2 t / ml, or even above 3 t / ml. The transport wagons are preferably chosen from the group consisting of VADs and MFSs. Each transport wagon may comprise a belt conveyor and a boom equipped with a belt conveyor. At least some of the transport wagons may comprise a boom holder configured to support the boom of the wagon adjacent to it and preceding it in the direction of advancement of the granular product. This makes it possible to move the granular product from one transport wagon to another, up to the last transport wagon. When the latter is filled, the penultimate transport wagon is loaded, and so on until, for example, all the transport wagons of the work train are filled.The last transport wagon may not have an arrow. The number of transport wagons can be between 1 and 20.

[0038] Such a train allows a large mass of granular product to be stored, optimizing the length of the train, while respecting the loading height constraint and the regulatory constraint. Thus, the intervention duration can be reduced for the same length of railway track renewal and / or the length of railway track renewal during an intervention can be increased for the same intervention duration.

[0039] The train may include at least one locomotive, for example hydrogen, electric or diesel, configured to pull all or part of the wagons.

[0040] According to another aspect, in combination with the above, there is provided a method of loading a work train as defined above with a granular product, comprising: a. loading the granular product onto the first belt conveyor of the interface wagon(s) at the side walls using a construction machine, b. conveying the granular product on the first belt conveyor and the second belt conveyor to the transport wagon.

[0041] Such loading can be carried out using a construction machine separate from a stripper, at low height on the interface wagon, while the granular product can be stored for transport in large quantities using the large storage capacity transport wagon.

[0042] This meets the various constraints mentioned above while maximizing the loading capacity of the work train in granular product.

[0043] The granular product can be loaded from a construction site in the case of used granular product to be removed. The granular product can be a new material loaded from a loading platform and intended for a construction site to be supplied with new material. The work train can be used successively for the removal of the used granular product and then for the supply of new granular product. Brief description of the drawings

[0044] Other features, details and advantages will become apparent upon reading the detailed description below, and upon analyzing the attached drawings, in which: [ Fig. 1 ] shows schematically, in side view, an example of an interface wagon. [ Fig. 2 ] shows in schematic cross-sectional view along II-II the interface wagon of the figure 1 . [ Fig. 3 ] shows a schematic cross-sectional view along III-III according to one embodiment. [ Fig. 4] shows a schematic and partial side view of an example of a work train. [ Fig. 5 ] shows in a top view, schematic and partial, an example of a work train during the implementation of a loading process according to an example. [ Fig. 6 ] shows in a top view, schematic and partial, an example of a work train during the implementation of a loading process according to another example. [ Fig. 7 ] shows in a top view, schematic and partial, an example of a work train during the implementation of a loading process according to another example. [ Fig. 8 ] shows in a top view, schematic and partial, an example of a work train during the implementation of a loading process according to another example. Description of the embodiments

[0045] In the various figures, the same references designate identical or similar elements. For the sake of brevity, only the elements which are useful for understanding the example described are shown in the figures and are described in detail below.

[0046] In the following description, when reference is made to absolute position qualifiers, such as the terms "front", "rear", "top", "bottom", "left", "right", etc., or relative position qualifiers, such as the terms "above", "below", "upper", "lower", etc., or to orientation qualifiers, such as "horizontal", "vertical", etc., reference is made, unless otherwise specified, to the orientation of the figures or of a wagon or train in its running position on rails.

[0047] Reference is now made to the figure 1. This represents an interface wagon 1 for a works train, configured to receive a granular product P loaded from a public works machine, not illustrated in this figure, but represented subsequently, consisting in this example of a rail-road excavator, for example. The granular product P comprises ballast or any other granular material taken during the renewal of railway tracks. The interface wagon 1 has been represented on rails R shown in dotted lines in this figure.

[0048] The interface wagon 1 comprises a chassis 2 comprising a frame 4 elongated along a longitudinal axis X of the interface wagon 1 between two longitudinal ends 5 of the frame 4. The interface wagon 1 also comprises bogies 6 comprising railway axles 7, themselves comprising wheels and a transverse axle 3 for connecting the wheels, in a manner known per se. As can be seen in the figure 2, the interface wagon 1 comprises a first belt conveyor 10 arranged on the frame 4 of the chassis 2 and configured to circulate the granular product P along the longitudinal axis X.

[0049] The interface wagon 1 also comprises an upwardly inclined boom 11 arranged near one of the longitudinal ends 5 of the frame 4. The boom 11 forms an inclined part of which a first end 8 is arranged at the level of the belt conveyor 10 and a second end 9, opposite the first, is located at a height greater than the height of the rest of the interface wagon 1, as visible on the figure 1The interface wagon 1 comprises a second belt conveyor 12 arranged on the boom 11 and configured to circulate the granular product from the end 19 of the first belt conveyor 10 to the top of the boom 11, at the second end 9 thereof, so as to allow the granular product P to be discharged into an adjacent wagon, not shown in this figure, which will be illustrated and presented subsequently.

[0050] The granular product P arrives on the first belt conveyor 10 laterally to it, laterally to the interface wagon 1. The granular product P circulates using the first belt conveyor 10 then the second belt conveyor 12 in the direction indicated by the arrow on the figure 1 .

[0051] In theory, the maximum storage capacity of interface wagon 1 in this example is approximately 1 t / ml, i.e. of the order of the maximum capacity of a flat wagon.

[0052] As visible on the figure 2, the frame 4 comprises a bottom 13 arranged above the axles 3 and supporting the first belt conveyor 10. The frame 4 comprises two side walls 14 surrounding the first belt conveyor 10 and configured to receive the load of granular product P. These two side walls are of low height, for example having a height h of less than 0.5 m. They extend along the longitudinal axis X and are arranged on either side of the bottom 13, laterally to it. The side walls 14 are vertical in this example. In the example illustrated, the frame 4 comprises two extensions 15 arranged respectively on the two side walls 14, forming complementary walls and being in this example inclined outwards and upwards relative to the side walls 14. It does not depart from the scope of the present disclosure if the side walls are made in a single piece or otherwise, if they are vertical or inclined over their entire height.The risers can be fixed, removable or retractable. They can be used to guide the granular product P towards the first belt conveyor 10 during loading using public works machinery.

[0053] The loading height Hc in such an interface wagon 1 from the top of the rail R on which the interface wagon 1 rests, that is to say from a lower point of a wheel of the interface wagon 1 in contact with the rail, is for example between 1 m and 2 m, in this example equal to approximately 1.5 m. It is thus possible to load laterally to the interface wagon 1 at a low height, with the public works machine, so as to comply with the loading height constraints.

[0054] Interface wagon 1 has a low capacity, not being designed to store granular product, but it allows the interface to be made between a public works machine other than a stripper and a wagon which may have a greater storage capacity, to store and allow the transport of a greater mass of granular product P. Interface wagon 1 can nevertheless store granular product if necessary, at a rate of approximately 1 t / ml.

[0055] In the example illustrated, the interface wagon 1 comprises a motorization 16 to drive the first and second belt conveyors 10 and 12 in rotation. In addition, the bogies 6 are motorized. This allows autonomy of the interface wagon 1 which can move independently of other wagons or tow one or more adjacent wagons.

[0056] The frame 4 comprises two buffers 17 arranged respectively at its longitudinal ends 5. The frame 4 extends between the two buffers 17 over a length L of between 15 ml and 25 ml, in this example equal to approximately 18 ml.

[0057] The flow rate of the first and second belt conveyors 10 and 12 is for example between 800 m 3 < / h and 1200 m 3 < / h of granular product P, being in particular equal to approximately 1000 m 3 < / h.

[0058] The interface wagon 1 further comprises an arrow holder 18 arranged near one of the longitudinal ends 5 which is opposite the longitudinal end 5 near which the arrow 11 is arranged. The arrow holder 18 makes it possible to support a arrow of another wagon. The arrow holder 18 is thus useful in the event that another wagon comprising a arrow is present next to the interface wagon 1, on the side of the arrow holder 18. Such another wagon, the arrow of which is illustrated in dotted lines on the figure 1, can be an interface wagon similar or identical to interface wagon 1, or can be another type of wagon. We visualize on the figure 1 that this other wagon located on the side of arrow holder 18 has its arrow actually placed on arrow holder 18.

[0059] It has been represented on the figure 4 an example of a work train 100 comprising an interface wagon 1 and a transport wagon 20 of the granular product P forming an adjacent wagon arranged next to the interface wagon 1, on the side of the boom 11, so as to receive the discharge of granular product P from the second belt conveyor 12 of the interface wagon 1. The transport wagon 20 is furthermore configured to support the boom 11 of the interface wagon 1. In the example illustrated, the transport wagon 20 has a height much greater than that of the interface wagon 1 which gives it a greater storage capacity during transport.

[0060] Such a work train 100 makes it possible to load the interface wagon 1 at a low height with granular product P using a public works machine operating at a height compatible with low-height catenaries, while providing a large storage capacity for granular product P for transport using the transport wagon 20.

[0061] In the example illustrated on the figure 4, the work train 100 comprises two interface wagons 1 arranged side by side, namely a first interface wagon 1a and a second interface wagon 1b. In this case, the second interface wagon 1b is adjacent to the transport wagon 20 forming the adjacent wagon. The first interface wagon 1a is adjacent to the second interface wagon 1b opposite the transport wagon 20. The first interface wagon 1a is identical in this example to the second interface wagon 1b, which constitutes for the first interface wagon 1a the adjacent wagon into which the granular product P is poured from the second conveyor 12 of the first interface wagon 1a. The second interface wagon 1b comprises an arrow holder 18 supporting the arrow 11 of the first interface wagon 1a.

[0062] We visualize on the Figure 5that a first public works machine Ea can load the first interface wagon 1a and a second public works machine Eb can load the second interface wagon 1b.

[0063] Each of the first and second interface wagons 1a and 1b comprises in this example a backup system in the event of failure of the motorization of one of the first and second interface wagons 1a and 1b. Such a backup system allows, for example, for the interface wagon to motorize the first and second conveyors of the adjacent interface wagon having a faulty motorization.

[0064] The backup system may include backup batteries and / or a backup motor. Alternatively or additionally, the backup system may include a hydraulic cable and connectors provided on each interface wagon so as to connect the interface wagon with a faulty motorization to the other interface wagon, called the "backup" wagon. This allows for autonomous motorization of all two interface wagons 1a and 1b, even in the event of a failure of the motorization of one of the two interface wagons. The backup motorization also allows for the proper operation of the first and second belt conveyors 10 and 12 for each of the interface wagons 1a and 1b, even in the event of a failure of the motorization of one of them.It should be noted that in the event of failure of the motorization of the bogies of one of the interface wagons, the motorization of the bogies of the other interface wagon may be sufficient to allow the autonomous movement of the two interface wagons 1a and 1B together.

[0065] The work train 100 includes, still in the example of the Figure 5, at least two transport wagons 20, two of which are visible in this figure, of large capacity. The transport wagons 20 are VADs in this example. Each transport wagon 20 itself comprises a belt conveyor 21 and a boom 22 equipped with a belt conveyor 23. At least some of the transport wagons may comprise a boom holder configured to support the boom of the wagon which is next to it, preceding it. The belt conveyors 21 and 23 make it possible to move the granular product P from one transport wagon 20 to the next, up to the last transport wagon 20. When the latter is filled, the penultimate transport wagon 20 is loaded, and so on until all the transport wagons 20 of the work train 100 are filled. The last transport wagon may not have a boom.

[0066] Such a work train 100 makes it possible to store a large mass of granular product P, without extending the length of the train, while respecting the loading height and regulatory constraints. Thus, the intervention duration can be reduced for the same length of renewal of the railway tracks and / or the length of renewal of the railway tracks during an intervention can be increased for the same intervention duration.

[0067] The work train 100 may comprise at least one locomotive, for example electric or diesel or hydrogen, configured to pull all or part of the wagons.

[0068] We also visualize on the Figure 5the method of loading the work train 100 with the granular product P, comprising the loading of the granular product P onto the first belt conveyor 10 of the or, in this example, the interface wagons 1, denoted respectively 1a and 1b, at the level of the side walls 14 using one or more public works machine(s) Ea and Eb. The method then comprises the conveying on the first belt conveyor 10 and the second belt conveyor 12 of the granular product P to the transport wagon 20. The conveying of the granular product P continues using the belt conveyors 21 and 23 of the transport wagons 20 as explained above.

[0069] It has been represented on the figure 6another example of implementation of the present disclosure. In this example, transport wagons 20 loaded with granular product P can be unloaded onto platforms called unloading areas, which is very difficult to envisage if the transport wagons were flat wagons. In this case, the site is organized with a shuttle of a set of transport wagons 20 which are VAD or MFS, which shuttle ensures the transfers of granular product P, according to the double arrow illustrated on the figure 6 , from the loading station Zc at the construction site using public works machinery Ea and Eb to the unloading area Zd. This saves intervention time, since loading is done on one side while unloading takes place on the other side. On the figure 6, we see the shuttle 50 formed by three transport wagons 20 and a locomotive of the work train 100 located in the unloading area Zd, while the rest of the work train 100 is being loaded at the loading station Zc, on the construction site.

[0070] Interface wagon(s) 1 can still be used, as shown in the figure 7 , to bring new granular product P from a loading platform arranged along the track to the construction site in order to supply it with new granular product P. The works train 100 will then be able to make rotations, therefore back and forth, according to the double arrow illustrated in this figure, between the construction site which constitutes the unloading zone Zd and the loading zone Zc at the platform. We can see that the public works machines Ea and Eb used are mobile road excavators, in this example.

[0071] In the embodiment of the figure 8 , the site includes a zone Z1 where used granular product P is removed and evacuated using work train 100, as described with regard to the Figure 5 , and another zone Z2 where a new granular product P is unloaded and deposited on the site using construction machinery. The train loaded with new granular product P can be a work train 100 for example. We can see on the figure 8 unloading new granular P product using an unloading belt 51 in the railway renovation area. This allows, simultaneously, loading a used granular P product and unloading a new granular P product in two different areas of the site. This saves time during the intervention.

[0072] The number of interface wagons 1 can be between 1 and 3. In particular, a work train 100 can comprise three interface wagons 1, which can be loaded with granular product P simultaneously.

Claims

1. Interface wagon (1; 1a, 1b) for a work train (100), configured to receive a granular product (P) loaded from a public works machine (E;Ea, Eb), comprising: - a chassis (2) comprising a frame (4) elongated along a longitudinal axis (X) of the interface wagon (1) between two longitudinal ends (5) and bogies (6) supporting said frame (4), - a first belt conveyor (10) arranged on the frame (4) of the chassis (2) and configured to circulate the granular product (P) along the longitudinal axis (X), - an inclined boom (11) arranged near one of the longitudinal ends (5) of the frame (4) and - a second belt conveyor (12) arranged on the boom (11) and configured to circulate the granular product (P) from one end (19) of the first belt conveyor (10) to the top of the boom (11) so as to allow the granular product (P) to be discharged into an adjacent wagon, in which the frame (4) comprises two side walls (14) surrounding the first belt conveyor (10) and configured to receive the loading of granular product (P).; 2. Wagon (1; 1a, 1b) according to claim 1, in which the frame (4) comprises a bottom (13) arranged above the axles (3) and supporting the first belt conveyor (10).

3. Wagon (1; 1a, 1b) according to claim 1 or 2, in which the frame (4) comprises two extensions (15) arranged respectively on the two side walls (14), forming complementary walls and preferably arranged inclined outwards relative to the side walls (14).

4. Wagon (1; 1a, 1b) according to any one of the preceding claims, in which the loading height (Hc) from the top of a rail (R) on which the interface wagon (1; 1a, 1b) rests is between 1 m and 2 m, preferably equal to approximately 1.5 m.

5. Wagon (1; 1a, 1b) according to any one of the preceding claims, comprising a motorization (16) for driving the first and second belt conveyors (10, 12) in rotation.

6. Wagon (1; 1a, 1b) according to any one of the preceding claims, in which the bogies (6) are motorized.

7. Work train (100) comprising an interface wagon (1; 1a, 1b) according to any one of the preceding claims, and a transport wagon (20) of the granular product (P) forming said adjacent wagon arranged next to said interface wagon (1; 1a, 1b) so as to receive the discharge of granular product (P) from the second belt conveyor (12) of the interface wagon (1; 1a, 1b).

8. Train (100) according to the preceding claim, comprising two interface wagons (1; 1a, 1b) arranged side by side, namely a first and a second interface wagon (1; 1a, 1b), each of the two interface wagons (1; 1a, 1b) comprising an emergency motor in the event of failure of the motor of the other of the first and second two interface wagons (1; 1a, 1b).

9. Train (100) according to claim 7 or 8, comprising at least two transport wagons (20) with a large storage capacity for granular product (P), each having in particular a maximum capacity greater than 2 t / ml, preferably chosen from the group consisting of VADs and MFSs.

10. Method for loading a work train (100) according to any one of claims 7 to 9 with a granular product (P), comprising: a. loading the granular product (P) onto the first belt conveyor (10) of the interface wagon(s) (1; 1a, 1b) at the side walls (14) using a public works machine (E; Ea, Eb), b. conveying on the first belt conveyor (10) and the second belt conveyor (12) the granular product (P) to the transport wagon (20).

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