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Technical Reports

Broken Rims in Railroad Wheels

Broken wheels are one of the most common types of equipment-caused train accidents. The failure of rail car wheel rims, which are usually the result of shattered rims or vertical split rims (VSR), are the leading cause of wheel-related accidents, and they are increasing as a percentage of all...

Locomotive Emissions Measurements for Various Blends of Biodiesel Fuel

The objective of this project was to assess the effects of various blends of biodiesel on locomotive engine exhaust emissions. The emission tests were conducted on two locomotive models, a Tier 2 EMD SD70ACe and a Tier 1 Plus GE Dash9-44CW, using two baseline fuels: (1) conventional EPA ASTM No. 2-...

Trespass Event Risk Factors

The Volpe Center has used three sources of data—the Federal Railroad Administration’s required accident reports, locomotive video, and U.S. Census data—to investigate common risk factors for railroad trespassing incidents, the leading cause of rail-related deaths in the U.S. Risk factors found...

Developing a Reliable Signal Wire Attachment Method

The goal of this project was to develop a better attachment method for rail signal wires to improve the reliability of signaling systems. EWI conducted basic research into the failure mode of current attachment methods and developed and tested a new process that provides improved performance over...

BNSF San Bernardino Case Study: Positive Train Control Risk Assessment

The Federal Railroad Administration funded the BNSF San Bernardino Case Study to verify its Generalized Train Movement Simulator (GTMS) risk assessment capabilities on a planned implementation of the I-ETMS PTC system. The analysis explicitly simulated a 10-year period of railroad operations....

Residual Stress Measurements of Retrofitted Tank Car Weldments

A series of residual stress measurements were made on two tank cars that were retrofitted with stiffener beams. The measurements were made on the tank shell exterior in the vicinity of fillet skip welds, which were used to attach the stiffener beams to the tank structure. One of the cars had been...