Interface wagon and work train comprising such a wagon

Abstract

Interface wagon (1; 1a, 1b) for a works 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) of so as to allow the granular product (P) to be discharged into an adjacent wagon. Abstract figure: Figure 1

Description

Title of the invention: Interface wagon and work train comprising such a wagon Technical field

[0001] The present 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 as well as 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 interventions are scheduled between train passages, particularly at night and on weekends. The intervention time is therefore necessarily limited. For example, railway track renewal takes place at night over a period of 8 or 9 hours, during which 6 hours of actual intervention are planned.

[0004] The old ballast to be removed forms a mass of approximately 2 t to 4 t per linear meter (ml) 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 ecological.

[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. The known types of wagons which have the greatest transport capacities are VAD for Self-Unloading Vehicle, having a capacity for example 2.2 t / ml or 2.5 t / ml depending on the model or MFS, for example MFS 120, for MaterialFôrder 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 construction sites, very specific machines called strippers are used to load wagons with high side edges, such as VAD or MFS for example. However, for smaller construction sites or for construction sites requiring the removal of fill material in addition to the 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 lines and can therefore only load the material onto wagons with low sides of the flat wagon type.

[0009] It should be added that, in the context of certain construction sites, particularly in areas with a high population density, the length of the 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 side walls of the wagon without obtaining a new approval.

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

[0012] By increasing the material transport capacities, 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 the production costs.

[0013] There is thus a need to benefit from a work train making it possible to increase the material transport capacities without significantly lengthening the train and taking into account the constraints of loading height of granular product and the 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] The present disclosure improves the situation.

[0015] An interface wagon for a works train 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 arrow arranged near one of the longitudinal ends of the frame and - a second belt conveyor disposed 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] This provides a wagon, which may have a low capacity, making it possible to provide an interface between a public works machine other than a de-slitter and a wagon which may have a greater capacity, to store and allow the transport of a greater mass of granular product.

[0017] 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.

[0018] By "public works machinery" is meant a machine of the excavator or digger type, in particular rail-road, distinct from a de-ballasting machine. By "granular product" is meant any type of ballast, aggregate, taken from an intervention zone during the renewal of railway tracks.

[0019] The features set out in the following paragraphs may, optionally, be implemented, independently of one another or in combination with one another:

[0020] The frame may include a bottom disposed above the axles and supporting the first belt conveyor. The frame may include two side walls surrounding the first belt conveyor.

[0021] In this case, 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.

[0022] The height of the side walls including any additional walls may be less than 1 m, in particular 0.5 m.

[0023] The loading height in such an interface wagon from the top of a rail on which the interface wagon rests is for example between 1 m and 2 m, preferably equal to 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 a public works machine.

[0024] The interface wagon may include a motorization for rotating the first and second belt conveyors. Such a motorization includes, for example, a thermal, electric or hydrogen engine. The motorization may also drive additional functions such as lighting, or other.

[0025] There are generally 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.

[0026] The bogies are preferably motorized, in particular hydraulic or electrical. The drive of the bogies 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.

[0027] The frame may comprise 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.

[0028] The flow rate of the first and second belt conveyors is for example between 800 m3 / h and 1200 m3 / h of granular product, being in particular equal to approximately 1000 m3 / h.

[0029] According to another aspect, in combination with the above, there is provided a work train comprising an interface wagon as defined above, and a transporting the granular product forming said adjacent wagon disposed 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.

[0030] Such a train makes it possible to load the interface wagon with a public works machine at a low height 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.

[0031] 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. Still 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.

[0032] Still in this case, a first public works machine can load the first interface wagon and a second public works machine can load the second interface wagon. This makes it possible to increase the loading rate of granular product in the work train.

[0033] The second interface wagon advantageously comprises a boom holder configured to support the boom of the first interface wagon. Such a boom holder is advantageously arranged near a longitudinal end of the second interface wagon opposite that which is close to the boom.

[0034] Each of the first and second interface wagons preferably comprises 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.

[0035] 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 much greater than 1 t / ml, preferably greater than 2 t / ml, or even greater than 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 arrow of the wagon next to it and preceding it in the direction of advancement of the granular product. This allows the granular product to be moved from one transport wagon to another, up to the last transport wagon. When the latter is full, 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.

[0036] Such a train makes it possible to store a large mass of granular product, by 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 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.

[0037] The train may comprise at least one locomotive, for example hydrogen, electric or diesel, configured to pull all or part of the wagons.

[0038] 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) using a public works machine, b. conveying on the first belt conveyor and the second belt conveyor of the granular product to the transport wagon.

[0039] Such loading can be carried out using a public works 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.

[0040] Thus, the various constraints mentioned above are satisfied while maximizing the loading capacity of the work train with granular product.

[0041] The granular product may be loaded from a construction site in the case of used granular product to be removed. The granular product may be a new material loaded from a loading platform and intended for a construction site to be supplied with new material. The work train may 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

[0042] Other characteristics, details and advantages will appear on reading the detailed description below, and on analyzing the attached drawings, in which:

[0043] [Fig-1] shows schematically, in side view, an example of an interface wagon.

[0044] [Fig.2] shows in schematic view in cross section along II-II the wagon interface of [Fig.l].

[0045] [Fig.3] shows in schematic view in cross section along III-III according to a mode of realization.

[0046] [Fig.4] shows in a schematic and partial side view an example of a train of works.

[0047] [Fig.5] shows in a top view, schematic and partial, an example of a train of work during the implementation of a loading process according to an example.

[0048] [Fig.6] shows in a top view, schematic and partial, an example of a train of work when implementing a loading process according to another example.

[0049] [Fig.7] shows in a top view, schematic and partial, an example of a train of work when implementing a loading process according to another example.

[0050] [Fig.8] shows in a top view, schematic and partial, an example of a train of work when implementing a loading process according to another example. Description of the embodiments

[0051] 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.

[0052] 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.

[0053] Reference is now made to [Fig.l]. 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.

[0054] 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 [Fig.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.

[0055] The interface wagon 1 further 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 in [Fig.l]. The 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.

[0056] The granular product P circulates using the first belt conveyor 10 and then the second belt conveyor 12 in the direction indicated by the arrow in [Fig.l].

[0057] In theory, the maximum storage capacity of the interface wagon 1 is in this example equal to approximately 1 t / ml, i.e. of the order of the maximum capacity of a flat wagon.

[0058] As can be seen in [Fig.2], the frame 4 comprises a base 13 arranged above the axles 3 and supporting the first belt conveyor 10. The frame 4 also comprises two side walls 14 surrounding the first belt conveyor 10. 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 base 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.

[0059] The loading height Hc in such an interface wagon 1 from the top of the rail R on which the interface wagon 1 rests is for example between 1 m and 2 m, in this example equal to approximately 1.5 m. It is thus possible to load at a low height, with the public works machine, so as to comply with the loading height constraints.

[0060] The 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 different from a stripper and a wagon which can have a greater storage capacity, to store and allow the transport of a greater mass of granular product P. The interface wagon 1 can nevertheless store granular product if necessary, at a rate of approximately 1 t / ml.

[0061] 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.

[0062] 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.

[0063] The flow rate of the first and second belt conveyors 10 and 12 is for example between 800 m3 / h and 1200 m3 / h of granular product P, being in particular equal to approximately 1000 m3 / h.

[0064] The interface wagon 1 also 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 case where 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 in [Fig. 1], may be an interface wagon similar or identical to the interface wagon 1, or may be another type of wagon. It can be seen in [Fig. 1] that this other wagon located on the side of the arrow holder 18 has its arrow actually placed on the arrow holder 18.

[0065] [Fig. 4] shows an example of a work train 100 comprising an interface wagon 1 and a transport wagon 20 for 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.

[0066] 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.

[0067] In the example illustrated in [Fig.4], the work train 100 comprises two wagons interface wagon 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 discharged 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.

[0068] It can be seen in [Fig.5] that 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.

[0069] 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.

[0070] The backup system may comprise backup batteries and / or a backup motor. Alternatively or additionally, the backup system may comprise a hydraulic cable and connectors provided on each interface wagon so as to connect the interface wagon having a faulty motorization to the other interface wagon called "backup". This allows for autonomous motorization of the entire 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 Ia and IB.

[0071] The work train 100 comprises, still in the example of [Fig. 5], at least two transport wagons 20, two of which are visible in this figure, of large capacity. The transport wagons 20 are VAD 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 adjacent 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 wagon of transport 20. When the latter is full, the penultimate transport wagon 20 is loaded, and so on until all the transport wagons 20 of the work train 100 are full. The last transport wagon may not have a boom.

[0072] 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.

[0073] 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.

[0074] [Fig.5] also shows the process 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, 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.

[0075] [Fig. 6] shows another 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 in [Fig. 6], from the loading station Zc to the site using the public works machines Ea and Eb to the unloading area Zd. Thus, intervention time can be saved, since the loading is done on one side while the unloading takes place on the other side. In [Fig.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.

[0076] The interface wagon(s) 1, as illustrated in [Fig.7], can also be used to bring new granular product P from a loading platform arranged along the track to the site in order to supply it with product. granular P new. The work train 100 will then be able to make rotations, therefore back and forth, according to the double arrow illustrated in this figure, between the site which constitutes the unloading zone Zd and the loading zone Zc at the platform level. We can see that the public works machines Ea and Eb used are mobile road excavators, in this example.

[0077] In the embodiment of [Fig. 8], the site comprises a zone Z1 where used granular product P is removed and evacuated using the work train 100, as described with respect to [Fig. 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 may be a work train 100 for example. [Fig. 8] shows the unloading of new granular product P using an unloading belt 51 in the railway renovation zone. It is thus possible, simultaneously, to load a used granular product P and unload a new granular product P in two different zones of the site. This can thus save time on the intervention.

[0078] 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

Claims

1. Interface wagon (1; 1a, 1b) for a works 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.

2. Wagon (1; 1a, 1b) according to claim 1, wherein the frame (4) comprises a bottom (13) arranged above the axles (3) and supporting the first belt conveyor (10), and two side walls (14) surrounding the first belt conveyor (10).

3. Wagon (1; 1a, 1b) according to the preceding claim, in which the frame (4) comprises two extensions (15) arranged respectively on the two side walls (14), forming complementary walls and preferably arranged in an outwardly inclined manner 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- preceding, 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) 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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