Technical Reports

Advanced Railroad Wheel/Rail Interaction Force Measurement

The Phase I research into the development of a novel, cost effective and efficient wheel/rail interaction force measurement system demonstrated the ability to use silicon strain gauges, fabricated with MEMS manufacturing techniques, to measure the types of forces seen in car wheels. Silicon strain...

Vehicle/Track Interaction Tests on Heavy Tonnage Loop

Two vehicle/track interaction tests were conducted by Transportation Technology Center, Inc. (TTCI) at the Facility for Accelerated Service Testing (FAST), Pueblo, Colorado. TTCI, a subsidiary of the Association of American Railroads (AAR), performed the tests on FAST's Heavy Tonnage Loop (HTL) in...

Test and Evaluation of Rail Flaw Detection Technologies

Internal flaws in rail occur as a consequence of the accumulation of fatigue under repeated loading. Inspection of the rail to detect flaws before they progress to complete failure is thus very important. Advanced nondestructive inspection techniques are being pursued to improve rail safety,...

Safety of Passenger Vehicle Dynamics: Simulation and Test Correlations for a Passenger Car with Non-Equalized Trucks

This report presents a summary of the field test results and correlations with computer simulation for a rail passenger car which has non-equalized trucks. The tests and OMNISIM simulation correlations included vehicle response to variations in vertical alignment, steady curving with spirals,...

Human Factors Phase IV: Dynamic Risk Estimation Using the Safety State Model

This report covers the theoretical development of the safety state model for railroad operations. Using data from a control automation experiment, experimental applications of the model is demonstrated. A stochastic model of system behavior is developed which is used to estimate the dynamic risk...

Automated Measurements of Lateral Track Panel Strength and Examinations of Track Maintenance Effects Using AAR's Track Loading Vehicle

This report summarizes test results and findings under the project "TLV Track Panel Shift and Lateral Track Strength Tests." The project was jointly funded by AAR and FRA. These tests were performed primarily off-site on Norfolk Southern revenue tracks, but a significant portion of tests was...

Results of Laboratory Quasi-Static Jacking Tests on Three Vehicles

Laboratory quasi-static jacking tests were performed on three vehicles at the Transportation Technology Center, Pueblo, Colorado. Results indicate vehicle wheel unloading that occurred during the tests varied with cross level difference, car body torsional stiffness, truck spacing, and vehicle...

Distributions of Dynamic Wheel/Rails Under Heavy Axle Loads

Under the Heavy Axle Load (HAL) program funded by the Association of American Railroads (AAR) and the Federal Railroad Administration (FRA), a test activity was initiated in 1997 to study the relationships between dynamic vehicle responses and track geometry conditions. As a first step, analyses...

Improved Roller Bearing Wayside Detection Research - Phase I Laboratory Test Report

A series of tests were performed at the Bearing Test Facility at the Transportation Technology Center in Pueblo, Colorado, to gather acoustic and acceleration emissions for a number of roller bearing defect types designated by the rail industry as a priority. This database will be used to develop...

Effect of Track Twist on Vehicle Dynamic Performance: Final Report

Results of tests conducted at the Transportation Technology Center (TTC), Pueblo, Colorado, indicate that vehicle response to track twist varies significantly with car type. Critical response variables include car body torsional stiffness, truck spacing, track alignment (tangent or curve), track...

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Technical Reports