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TCRP Report 57: Track Design Handbook for Light Rail Transit

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TCRP Report 57: Track Design Handbook for Light Rail Transit T RANSIT C OOPERATIVE R ESEARCH P ROGRAM SPONSORED BY The Federal Transit Administration TCRP Report 57 Track Design Handbook for Light Rail Transit Transportation Research Board National Research Council TRANSIT COOPERATIVE RESEARCH PROGRAM Report 57 Track Design Handbook for Light Rail Transit PARSONS BRINCKERHOFF QUADE & DOUGLAS, INC. Herndon, VA Subject Area Rail Research Sponsored by the Federal Transit Administration in Cooperation with the Transit Development Corporation TRANSPORTATION RESEARCH BOARD NATIONAL RESEARCH COUNCIL NATIONAL ACADEMY PRESS Washington, D.C. 2000 TRANSIT COOPERATIVE RESEARCH PROGRAM TCRP REPORT 57 The nation’s growth and the need to meet mobility, Project D-6 Fy’95 environmental, and energy objectives place demands on public ISSN 1073-4872 transit systems. Current systems, some of which are old and in need ISBN O-309-06621-2 of upgrading, must expand service area, increase service frequency, Library of Congress Catalog Card No 99-76424 and improve efficiency to serve these demands. Research is 0 2ooO Transpotition Research Board necessary to solve operating problems, to adapt appropriate new technologies from other industries, and to introduce innovations into the transit industry. The Transit Cooperative Research Program (TCRP) serves as one of the principal means by which the transit industry can develop innovative near-term solutions to meet demands placed on it. The need for TCRP was originally identified in TRB Special Report 213-Research for Public Transit: New Directions, published in 1987 and based on a study sponsored by the Urban Mass Transportation Administration-now the Federal Transit Administration (FTA). A report by the American Public NOTICE Transportation Association (APTA), Transportation 2000, also The project that is the subject of this report was a part of the Transit Cooperative recognized the need for local, problem-solving research. TCRP, Research Program conducted by the Transportation Research Board with the modeled after the longstanding and successful National Cooperative approval of the Governing Board of the National Research Council. Such Highway Research Program, undertakes research and other technical approval reflects rhe Governing Board’s judgment that the project concerned is activities in response to the needs of transit service providers. The appropriate with respect to both the purposes and resources of the National scope of TCRP includes a variety of transit research fields including Research Council plan-ning, service configuration, equipment, facilities, operations, The members of the technical advisory panel selected to monitor this project and human resources, maintenance, policy, and administrative practices. to review this report were chosen for recognized scholarly competence and with TCRP was established under FTA sponsorship in July 1992. due consideration for the balance of disciplines appropriate to the project The Proposed by the U.S. Department of Transportation, TCRP was opinions and conclusions expressed or implied are those of the research agency authorized as part of the Intermodal Surface Transportation that performed the research. and while they have been accepted as appropriate Efficiency Act of 1991 (ISTEA). On May 13,1992, a memorandum by the technical panel. they are not necessarily those of the Transportation agreement outlining TCRP operating procedures was executed by Research Board, the National Research Council, the Transit Development the three cooperating organizations: FTA, the National Academies, Corporation, or the Federal Transit Administration of the U S Department of acting through the Transportation Research Board (TRB); and Transportation the Transit Development Corporation, Inc. (TDC), a nonprofit Each report is reviewed and accepted for publication by the technical panel educational and research organization established by APTA. according to procedures established and monitored by the Transportation TDC is responsible for forming the independent governing board, Research Board Executive Committee and the Governing Board of the National designated as the TCRP Oversight and Project Selection (TOPS) Research Council Committee. To save time and money in disseminating the research findings, the report is Research problem statements for TCRP are solicited periodically essentially the original text as submitted by the research agency This report has but may be submitted to TRB by anyone at any time. It is the not been edited by TRB responsibility of the TOPS Committee to formulate the research program by identifying the highest priority projects. AS part of the evaluation, the TOPS Committee defines funding levels and expected products. Special Notice Once selected, each project is assigned to an expert panel, appointed by the Transportation Research Board. The panels prepare The Transportation Research Board, the National Research Council, the Transit project statements (requests for proposals), select contractors, and Development Corporation, and the Federal Transit Administration (sponsor of provide technical guidance and counsel throughout the life of the the Transit Cooperative Research Program) do not endorse products or project. The process for developing research problem statements and manufacturers. Trade or manufacturers’ names appear herein solely b&cause they are considered essential to the clarity and completeness of the project reporting. selecting research agencies has been used by TRB in managing cooperative research programs since 1962. As in other TRB activ- ities, TCRP project panels serve voluntarily without compensation. Published reports of the Because research cannot have the desired impact if products fail to reach the intended audience, special emphasis is placed on TRANSIT COOPERATIVE RESEARCH PROGRAM disseminating TCRP results to the intended end users of the are available from: research: transit agencies, service providers, and suppliers. TRB provides a series of research reports, syntheses of transit practice, Transportation Research Board and other supporting material developed by TCRP research. APTA National Research Council will arrange for workshops, training aids, field visits, and other 2101 Constitution Avenue, NW Washinson, D.C 20418 activities to ensure that results are implemented by urban and rural transit industry practitioners. and can be ordered through the Internet at The TCRP provides a forum where transit agencies can http://www4.nationalacadem.ies.or@rb/homepage.nsf cooperatively address common operational problems. The TCRP results support and complement other ongoing transit research and training programs. Printed in the United Statesof America This Handbook will be of interest to light rail track system design engineers, oper- FOREWORD ations and maintenance professionals, vehicle design engineers and manufacturers, and BY StUfl others interested in the design of light rail track systems. The Handbook provides Transportation Research guidelines and descriptions for the design of various types of light rail transit track. The Board track structure types covered include ballasted, direct fixation (“ballastless”), and embedded track. The components of the various track types are discussed in detail. The guidelines consider the characteristics and interfaces of vehicle wheels and rail, track and wheel gauges, rail sections, alignments, speeds, and track moduli. The Handbook includes chapters on vehicles, alignment, track structures, track components, special trackwork, aerial structure/bridges, corrosion control, noise and vibration, signals, and traction power. These chapters provide insight into considerations that affect track design and require interface coordination. Transit agencies frequently build new light rail transit (LRT) systems, procure light rail vehicles (LRVs), and undertake track improvements to existing systems to increase operating speeds, enhance service, and expand ridership. Many agencies have experi- enced accelerated vehicle wear and track degradation, attributed to the increased speeds and incompatibility of contemporary LRVs with the track structure. These problems lead to reduced service quality and increased maintenance expenditures. Considerable research has been conducted in recent years to understand the mechanisms involved in track-vehicle interaction and its effect on track design. However, no widely accepted guidelines have been developed to aid in the design of light rail transit track. Consequently, transit agencies have frequently relied on practices developed primarily for heavy rail transit and freight operations that are not well suited for light rail transit systems. Under TCRP Project D-6, research was undertaken by Parsons Brinckerhoff Quade & Douglas to (1) better understand the interactions among track structure, LRVs, and operating characteristics and (2) develop a Handbook for the design of light rail tran- sit track to assist the various transit disciplines in selecting the appropriate track and vehicle characteristics for specific situations. To achieve the project objectives, the researchers first identified the track- structure parameters, vehicle characteristics, environmental factors, and operating conditions that influence track-vehicle interaction and, hence, should be considered in the design of ballasted, direct fixation, and embedded track systems. The researchers then collected and reviewed information pertaining to the design and construction of light rail transit track. A literature search of articles, manuals,
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