Bi-level Railway Car Access System with Intermediate Platform
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Solution Overview
Problem
Bi-level railway vehicles face a challenge in optimizing the number of passengers transported while minimizing station dwell time, as existing configurations either compromise on passenger capacity due to elevated access doors or reduce capacity by providing direct access that limits the number of passengers.
Innovation Solution
The proposed bi-level railway vehicle design features access doors positioned below the upper floor, with inclined ramps and strategically placed intermediate platforms, allowing for direct and indirect access while optimizing space for passenger seating and reducing downtime through efficient access routing and equipment placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If access doors are arranged above the bogies to maximize passenger space, then the number of passengers per carriage is improved, but the station dwell time increases due to additional steps required for access
Solution Approach 1:
The patent introduces a third vertical level (intermediate platform) between the access door level and the upper floor, creating a multi-level access structure. This dimensional change allows passengers to access the upper floor through multiple pathways (direct stairs from access landing, or via intermediate platform), thereby reducing station dwell time while maintaining maximum passenger capacity with the access door positioned above the bogie.
Solution Approach 2:
The intermediate platform acts as an intermediary element that mediates between the access door and the upper floor. It provides an alternative access route that reduces the number of steps passengers must climb directly from the access landing, thereby reducing station dwell time while allowing the access door to remain in the optimal position above the bogie for maximizing passenger space.
2Loss of time
If direct access passages are provided from access door to upper floor to reduce station dwell time, then the station dwell time is improved, but the number of passengers that can be transported is reduced
Solution Approach 1:
The access system is segmented into multiple independent pathways: (1) direct stairs from access landing to upper floor, (2) passage via intermediate platform to upper floor, and (3) passage via intermediate platform to lower floor. This segmentation allows the direct access pathway to reduce station dwell time while the other pathways and the intermediate platform itself provide additional passenger capacity that would be lost with a single direct access configuration.
3Loss of time
If access doors are positioned away from bogies to provide low-level access at platform level, then station dwell time is reduced, but the intermediate platforms and multiple staircases reduce passenger capacity
Solution Approach 1:
The intermediate platform serves multiple functions simultaneously: (1) it acts as an access point to the upper floor via stairs, (2) it provides an alternative access route to reduce station dwell time, (3) it serves as additional passenger standing space, and (4) it allows the access door to be positioned optimally above the bogie. This multi-functionality resolves the contradiction by making the intermediate platform beneficial for both access efficiency and passenger capacity.
Data Source
Figure 1
AI summary
The car (10) has a direct passage (46) ascending from an access bearing (42) to an intermediate platform (24) and a passage passing from the bearing to a lower floor (14) of a passenger compartment (12) in proximity to an access door (32). A direct ascending passage (48) ascends from the platform to an upper floor (16). A direct ascending passage (56) ascend from an access bearing (44) to an intermediate platform (26), and steps (54) descend from the bearing (44) to the floor (14). A direct access ascending passage ascend from the bearing (44) to the floor (16) close to an access door (34).