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General

Vertical Split Rim: Causes and Prevention

Vertical split rim (VSR) is a serious railway wheel failure mode that requires further research. Visual clues are not usually present until the crack propagates through the rim. To better understand the root causes of VSRs, the Federal Railroad Administration (FRA) and the Association of...

Short Line Safety Institute: Testing the Fidelity of Its Robust Model

The Short Line Safety Institute (SLSI) is dedicated to the continuous improvement of safety and safety culture across all short line and regional railroads in the United States. Strengthening a railroad’s safety culture may result in less frequent or severe accidents and create a safer working...

Office Safety Checker for Moving Block Train Control Systems

As part of a project sponsored by FRA, TTCI developed and analyzed a concept for the Office Safety Checker (OSC) component of the Moving Block Office (MBO), a segment of a moving block train control system concept. The OSC component performs a safety validation of MBO safety-critical functions...

Vehicle Dynamics Models for Derailment Incident Investigation

When investigating a train derailment, vehicle/track interaction (VTI) using vehicle dynamics simulations of the key vehicles in the derailed train can help identify specific derailment causes. From September 2018 to March 2021, the Federal Railroad Administration (FRA) contracted Sharma &...