The Federal Railroad Administration (FRA) was created by the Department ofTransportation Act of 1966. It is one of ten agencies within the U.S. Department ofTransportation concerned with intermodal transportation. FRA promotes safe,environmentally sound, successful railroad transportation to meet the needs of all customers today and tomorrow.
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In this section, we provide descriptions and comprehensive, official sources for FRA's regulations (also called rules), selected legislation, as well as policy and guidance documents. Additionally, you will find current topics of high interest or significant impact to Congress, railroads, employees, labor, public interest groups and other stakeholders.
FRA supports passenger and freight railroading through a variety of competitive grant, dedicated grant, and loan programs to develop safety improvements, relieve congestion, and encourage the expansion and upgrade of passenger and freight rail infrastructure and services. FRA also provides training and technical assistance to grantees and stakeholders.
Detailed Modeling of the Train-to-Train Impact Test
AUTHOR: Richard Stringfellow and Patricia Llana OFFICE: RPD REPORT NUMBER: DOT/FRA/ORD-07/20 KEYWORDS: Transportation, safety, crashworthiness, passenger rail vehicles, cab car end structure, locomotive ABSTRACT: This report describes the results of a finite element-based analysis of the train-to-train impact test conducted at the Federal Railroad
Administration’s Transportation Technology Center in Pueblo, CO, on January 31, 2002. The ABAQUS/Explicit dynamic finite
element code was used to simulate the first 0.5 second (s) of the collision. The primary objective of this program was to extend the use
of finite element-based models for simulating the crush of train structures to include vehicle-to-vehicle interactions.
A subset of the data collected during the test was first selected as a basis for comparison with model predictions. A finite element
model of the train was then developed. This model includes detailed representations of the end structures of the cab car and the
locomotive, and coarser representations of the back of these vehicle bodies and the trucks of the cab car. Connections between the cab
car body and trucks were modeled to allow for lift of the body during the collision. Trailing vehicles and vehicle-to-vehicle
connections were modeled using lumped mass parameters.
The results of the model were compared to the selected data. These comparisons indicate that the model captures many aspects of
collision behavior, with a fair degree of accuracy, especially over the first 0.25 s of the collision.