Railcar Side Sill Extension for 53-Foot Container Compatibility

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing 48-foot railroad freight cars cannot efficiently carry 53-foot intermodal cargo containers due to structural limitations, leading to idling of 48-foot well cars and high costs for new 53-foot well car units.

Innovation Solution

The method involves lengthening existing 48-foot container well cars by adding longitudinal extension portions to the side sills, revising the side sill structures, and extending the container well bottom structures to accommodate 53-foot containers while ensuring adequate vertical clearance, allowing for the use of preexisting support assemblies and maintaining structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If existing 48-foot well cars are used without modification, then structural integrity is maintained, but they cannot carry 53-foot containers

Engineering Contradiction:

Improvecontainer length accommodationVSAvoidcar body length

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The car body is divided into modular sections with extendable side sills. The side sills are segmented into original portions and add-on sections that can be independently installed and adjusted, allowing the car to accommodate longer containers while maintaining structural integrity of each segment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The extension is achieved by adding components in the longitudinal dimension rather than replacing the entire car body. The side sills are extended by adding sections along the length of the car, effectively increasing the container well length from 48 feet to 53 feet while keeping the original car structure intact.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Length of stationary object

If the car body is lengthened to accommodate 53-foot containers, then container capacity is improved, but vertical clearance at mid-length is reduced

Engineering Contradiction:

Improvecontainer well lengthVSAvoidvertical clearance height

Core Design Contradiction:

Length of stationary objectVSLength of moving object

Solution Approach 1:

The side sill structure has different properties at different locations. The add-on sections are designed with specific structural characteristics (such as increased height or different cross-section) at critical mid-length areas to maintain vertical clearance, while allowing full extension at other portions to accommodate the 53-foot container length.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If new 53-foot well car units are manufactured, then container compatibility is achieved, but costs increase significantly

Engineering Contradiction:

Improve53-foot container compatibilityVSAvoidconversion cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

Instead of discarding the existing 48-foot well car units, the invention recovers and utilizes them by adding extension sections. The original car body, side sills, and support structures are retained and enhanced rather than replaced, significantly reducing the cost compared to manufacturing entirely new 53-foot well car units.

Inventive Principle:

Principle #34Discarding and recovering

Solution Approach 2:

The side sill extension components are designed and prepared in advance as modular add-on sections that can be pre-fabricated and then installed on existing cars. This preliminary preparation of extension sections streamlines the conversion process and reduces overall manufacturing costs compared to custom-building new cars.

Inventive Principle:

Principle #10Preliminary action

4Length of stationary object

If side sills are extended by adding longitudinal portions, then container well length is increased, but structural complexity increases

Engineering Contradiction:

Improveside sill lengthVSAvoidside sill structure

Core Design Contradiction:

Length of stationary objectVSDevice complexity

Solution Approach 1:

The side sill structure is segmented into the original side sill and separate add-on sections. Each segment maintains a relatively simple, standardized structure that can be manufactured and installed independently. The segmentation avoids the need for complex custom-designed extended side sills while achieving the required length increase.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8291592B2Method of lengthening a container well of a railcar

Publication Date: 2012.10.23 GUNDERSON LLC

AI summary

A railroad freight car with a lengthened container well, including an extended and reinforced well car unit side sill, and a method for lengthening a container well of a railroad freight car intended for carrying an intermodal cargo container. A side sill extension member is welded into position, between a body bolster at each end of the container well unit and a nearest container support assembly, and a container-well bottom assembly is lengthened at each end of the container well. A longitudinally-extending doubler plate may be welded to the longitudinally central portion of the side sill, to ensure sufficient rail clearance at mid-length of the car.