Track Design Handbook for Light Rail Transit, Second Edition (2012) / Chapter Skim
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1-i Chapter 1 -- General Introduction Table of Contents CHAPTER 1 -- GENERAL INTRODUCTION 1-1 1.1 Introduction 1-1 1.1.1 Background 1-1 1.1.2 Purpose and Goals of the Handbook 1-1 1.1.3 The Handbook User 1-2 1.2 What Is Light Rail? 1-4 1.2.1 Background 1-4 1.2.2 Light Rail Defined 1-4 1.2.3 Light Rail as a Spectrum 1-5 1.2.4 Where the Rails and Wheels Meet the Road 1-6 1.2.5 The Regulatory Environment 1-6 1.3 Handbook Organization 1-7 1.4 Units of Measurement 1-8 1.5 The Endmark 1-9
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1-1 CHAPTER 1 -- GENERAL INTRODUCTION 1.1 INTRODUCTION The purpose of this Handbook is to provide those responsible for the design, procurement, construction, maintenance, and operation of light rail transit (LRT) systems an up-to-date guide for the design of light rail track, based on an understanding of the relationship of light rail track and other transit system components.
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Track Design Handbook for Light Rail Transit, Second Edition 1-2 the reader with current practical guidelines and procedures for the design of the various types of light rail track -- including ballasted, direct fixation, and embedded track systems -- and offers choices concerning the many issues that must be resolved during the design process. It discusses the interrelationships among the various disciplines associated with light rail transit engineering -- structures, traction power, stray current control, noise and vibration control, signaling, and electric traction power.
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General Introduction 1-3 In the case of the track alignment engineer, he or she will obviously need to work closely with other civil engineers on the project who are responsible for earthworks, drainage, and roadway work and the structural engineers responsible for bridges, walls, and other guideway structures. Less obvious, but just as important, is the need to coordinate with the following other team partners: • The operations planners, so the track alignment is supportive of the operating plan.
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Track Design Handbook for Light Rail Transit, Second Edition 1-4 1.2 WHAT IS LIGHT RAIL? 1.2.1 Background Light rail transit evolved from streetcar technology.
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General Introduction 1-5 1.2.3 Light Rail as a Spectrum While, as noted above, the Handbook is applicable to railway track engineering for a wide spectrum of railway systems, its principal focus is light rail transit. LRT itself is a broad spectrum and ranges from single unit streetcars running in mixed traffic within city streets at speeds as slow as 25 mph [40 km/h]
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Track Design Handbook for Light Rail Transit, Second Edition 1-6 stadtbahn end of the LRT spectrum. The second edition of the Handbook will not attempt to cover all of the nuances of the DMU mode; however much of the information contained in the Handbook will be directly applicable to professionals working on a DMU project.
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General Introduction 1-7 1.3 HANDBOOK ORGANIZATION Chapter 1 (this chapter) provides general introductory information.
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Track Design Handbook for Light Rail Transit, Second Edition 1-8 Chapter 10 highlights issues related to signals and related train control systems for light rail transit and discusses some of the interfacing issues and components that must be considered by a track designer. Chapter 11 presents elements pertinent to traction power, including supply system and substations, the catenary distribution system, and the power return through the running rails.
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From page 10... ...
General Introduction 1-9 "approximately one foot," the conversion to SI is given as 300 millimeters or 30 centimeters rather than an inappropriately exact conversion to 304.8 millimeters. Where formulae are used in the text, versions in both U.S.
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