This material is developed by AREMA technical committees, is published on the AREMA web site for comments and then is approved for publication in the Manual by the Association’s Board of Directors. INTRODUCTION The AREMA Manual for Railway Engineering contains principles, data, specifications, plans and economics pertaining to the engineering, design and construction of the fixed plant of railways (except signals and communications), and allied services and facilities. Correspondence regarding copyright permission should be directed to the Director of Administration, AREMA, 10003 Derekwood Lane, Suite 210, Lanham, MD 20706 USA. Photocopying or electronic reproduction and/or distribution of this publication is a violation of USA and International Copyright laws and is expressly prohibited. (Chapters 3 and 10 were combined in 2000 to form Chapter 30) Chapter 4Ĭopyright © 2010 by the AMERICAN RAILWAY ENGINEERING AND MAINTENANCE-OF-WAY ASSOCIATION All rights reserved No part of this publication may be reproduced, stored in an information or data retrieval system, or transmitted, in any form, or by any means-electronic, mechanical, photocopying, scanning, recording, or otherwise-without the prior written permission of the publisher. 2010 Manual for Railway Engineering Volume 1 1
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