Hourglass Autorack Car Variable Width Panel Design
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Solution Overview
Problem
Conventional autorack railcars have limited interior width for personnel to maneuver between side panels and vehicles, particularly with wide vehicles, due to their constant width design, which can lead to ergonomics issues and increased risk of vehicle damage during loading and unloading.
Innovation Solution
The design of a variable width, hourglass-shaped autorack railcar that expands width at specific locations to provide additional clearance, compliant with American Association of Railroads regulations, by using a configuration of center and intermediate panels that increase width towards the ends, allowing more room for crew operations and reducing vehicle damage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant width design is used for the railcar, then the structural simplicity and compliance with AAR regulations are maintained, but the interior width for personnel maneuvering is limited
Solution Approach 1:
The railcar side panels are divided into multiple segments (center panel and intermediate panels) that can be positioned at different longitudinal locations. This segmentation allows the width to vary along the length of the railcar while maintaining structural integrity and compliance with AAR regulations, providing greater interior space for personnel maneuvering where needed.
Solution Approach 2:
The railcar employs different panel configurations at different longitudinal locations along its length. The intermediate panels are positioned to create greater width in specific zones where personnel maneuvering is required, while maintaining the overall constant width profile elsewhere to comply with AAR regulations. This local variation in quality provides targeted improvement without compromising overall compliance.
2Ease of operation
If the railcar width is increased at the ends, then additional clearance is provided for loading and unloading operations, but the overall railcar width may approach regulatory limits
Solution Approach 1:
The railcar design incorporates intermediate panels that can be dynamically positioned or adjusted to optimize the interior width at the ends during loading and unloading operations. This dynamic configuration allows the railcar to provide maximum clearance when needed while maintaining compliance with AAR width regulations during normal operation.
Solution Approach 2:
Instead of uniformly increasing the railcar width throughout, the design utilizes the longitudinal dimension by positioning intermediate panels at specific locations along the length of the railcar. This creates a three-dimensional configuration where width is increased selectively in the end regions while maintaining constant width in the central region, thereby providing additional clearance without exceeding overall width regulations.
3Adaptability or versatility
If wide vehicles such as pickup trucks with dual rear wheels are transported, then the railcar must accommodate the maximum vehicle width, but this reduces the available interior width for personnel maneuvering
Solution Approach 1:
The side panels are segmented into center panels and intermediate panels that can be independently positioned. This segmentation allows the railcar to accommodate wide vehicles like pickup trucks with dual rear wheels in the central region while creating additional interior space in the end regions where personnel maneuvering occurs, thus resolving the conflict between vehicle accommodation and personnel mobility.
Solution Approach 2:
The railcar employs local quality variation by positioning intermediate panels to create greater width in end regions where personnel maneuvering is required, while maintaining the necessary width in central regions to accommodate wide vehicles. This localized approach ensures that personnel have adequate maneuvering space without compromising the ability to transport various vehicle types.
Data Source
AI summary
According to some embodiments, an articulated railcar comprises a first railcar and a second railcar coupled via an articulated railcar truck. The first railcar and the second railcar each comprise a first end, a second end, and a first longitudinal side and a second longitudinal side disposed between the first end and the second end. The first longitudinal side comprises a center panel and an intermediate panel. The center panel is disposed between a center of the railcar and the intermediate panel. The intermediate panel is disposed between the center panel and the first end or the second end. A width of the railcar at the intermediate panel is greater than a width of the railcar at the center panel.