Technical Reports

FRA Two Car Impact Test

Transportation Technology Center, Inc., a subsidiary of the Association of American Railroads, performed a full-scale impact test at the Federal Railroad Administration's Transportation Technology Center near Pueblo, Colorado. The April4, 2000 test was performed using two Budd Company Pioneer-type...

Tank Car Nondestructive Evaluation

An evaluation of nondestructive testing (NDT) methods, authorized for use in replacing the current hydrostatic pressure test for qualification or re-qualification of railroad tank cars, has been performed by the Transportation Technology Center, Inc. (TTCI), a subsidiary of the Association of...

Fatigue Tests on Trail Hitch at FAST- The FAT II Report

Cracks appeared in a hitch and its underdeck support on one of the three Trailer-onFlat Cars (TOFC) in the FAST (Facility for Accelerated Service Testing)train consist 3,000 miles after inspection (at 186,000 miles). As a result, a series of static and dynamic (FAST operation} tests was undertaken...

Extreme Conditions Impact on rapid Transit Systems: Effect on Automatic Train Control

Automatic Train Control (ATC) has gained wide acceptance and is presently used in all aspects of rapid rail operations. Because ATC has a limited range of detection, conditions outside those limits might present hazards to transit system operation. With a trend toward less human involvement in the...

Exploratory Soil Borings at Two Locations for the U.S. Department of Transportation

Exploratory borings and soil classification studies are reported on for two locations; southeast Kansas and northeast New Mexico. The object of the work was the revelation of sufficient sub-soil information to enable a decision on the part of the sponsoring agency as to where to most...

Evaluation of Squeal Noise from the WMATA Transit Car Disc Brake System: A Preliminary Investigation

This study was conducted as part of the Urban Rail Noise Abatement Program sponsored by the Office of Rail and Construction Technology of the Urban Mass Transportation Administration. The Washington Metropolitan Area Transit Authority (WMATA) rail transit car design adopted the use of disc brakes...

Evaluation and Service Testing of Prototype Empty/Load Brake Device to Reduce Wheel Spalling Due to Slide

The Transportation Technology Center, Inc. and New York Air Brake evaluated a prototype three-step graduated empty and load (E/L) brake device to reduce wheel spalling due to wheel slide on intermodal double-stack railcars. Analysis of the results showed an increase in the rate of wheel spalling on...

Electronically Controlled Pneumatic Brake Revenue Service Tests

This letter report, prepared by the Transportation Technology Center, Inc. (TTCI), Pueblo, Colorado, a subsidiary of the Association of American Railroads (AAR), summarizes the findings of the service testing of Electronically Controlled Pneumatic (ECP) Brakes, carried out between the spring of...

Effect of Track Twist on Vehicle Dynamic Performance

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...

Effect of Hollow-Work Wheels on Wheel and Rail Interaction with North American Freight Cars

This report examines the effect that hollow-worn wheels have on wheel and rail interaction for typical North American freight cars on tangent and curved track. Hollow wear tends to reduce the speed of which hunting starts and can increase the rail roll moment. However, hollow wear is not the sole...

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Technical Reports