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Technical Reports

Why do Passenger Trains Pass Stop Signals? A Systems View

This report documents the findings and recommendations from an investigation into stop signal violations at several passenger railroads. The study collected data on accidents related to stop signal overruns (SSO) from the National Transportation Safety Board (NTSB) reports and from the Federal...

Fiber Optic Train Tracking - Phase 1

The Federal Railroad Administration (FRA) contracted Transportation Technology Center, Inc. (TTCI) to test the train tracking capabilities of fiber optic acoustic detection (FOAD). Testing was performed to simulate train movements typically seen in normal operations on North American Freight...

Side Impact Test and Analyses of a DOT-117 Tank Car

The Federal Railroad Administration (FRA) conducted a side impact test on a U.S. Department of Transportation (DOT)-117J100W (DOT-117) tank car at the Transportation Technology Center (TTC) to evaluate the performance of the tank car under dynamic impact conditions and to provide data for the...

Side Impact Test and Analyses of a DOT-105 Tank Car

Transportation Technology Center, Inc. (TTCI) conducted a side impact test on a Department of Transportation (DOT)-105A500W (referred to DOT-105) tank car to evaluate the performance of it under dynamic impact conditions and to provide data for the verification and refinement of a computational...