Hot Axle Box Detectors - Siting

Transcription

1 GO/RT3207 Hot Axle Box Detectors - Siting Submitted by... R Merryweather Nominated Responsible Manager Approved by... M Harwood Chairman, Operations Standards Subject Committee Authorised by Synopsis To provide criteria for the installation of lineside hot axle box detectors in suitable locations and at appropriate intervals. This document is the property of Railtrack. It shall not be reproduced in whole or in part without the written permission of the Controller, Safety Standards. Published by Safety & Standards Directorate Railtrack Fitzroy House Euston Road London... Ken Burrage Controller, Safety Standards Copyright 1995 Railtrack

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3 Page 1 of 5 Contents Section Description Page Part A Issue record 2 Responsibilities and distribution 2 Implementation 2 Disclaimer 2 Supply 2 Part B 1 Purpose 3 2 Scope 3 3 Definitions 3 4 Provision of Detectors 3 Appendix A (Code of Practice) 1 Operational Siting Criteria 4 2 Technical Siting Criteria 4 R A I L T R A C K 1

4 Page 2 of 5 Withdrawn Document Part A Issue record This Standard will be updated when necessary by distribution of either a complete replacement or amended or additional pages. Amended or additional parts of revised pages will be marked by a vertical black line. Issue Date Comments 1 January 1995 Original Document. This supersedes Draft Group Standard GO/RT 3203, same title, dated July Responsibilities and Controlled copies of this Standard shall be complied with by infrastructure Distribution controllers, operating and engineering personnel responsible for determining locations and facilities for lineside hot axle box detectors. Implementation The provisions of this Standard are mandatory and apply from February Disclaimer The Safety & Standards Directorate (S&SD) shall use its best endeavours to ensure that the content, layout and text of its Standards are accurate, complete and in line with current best practice insofar as is reasonably practicable. It makes no warranties, express or implied, that compliance with all or any of its Standards shall be sufficient to ensure safe systems of work or operation. The S&SD will not be liable to pay compensation in respect to the content or subsequent use of its Standards, except where it can be shown to have acted in bad faith or there has been wilful default. Supply Controlled and uncontrolled copies of this Standard must be obtained from Railtrack, Safety & Standards Directorate, Support Unit, Floor 2, Fitzroy House, 355 Euston Road, London NW1 3AG 2 R A I L T R A C K

5 Page 3 of 5 Part B 1 Purpose To provide criteria for the installation of lineside hot axle box detectors in suitable locations and at appropriate intervals. 2 Scope This Standard applies to all running lines as defined in the Sectional Appendices. 3 Definition Responsible Manager - The Manager, designated by the organisation, having responsibility for the management of operational safety of the line concerned. 4 Provision of Detectors 4.1 Lineside hot axle box detectors are provided to supplement or replace the visual observation of passing trains by lineside staff, in particular signalmen. 4.2 The Responsible Manager must consider on which routes or sections of line detectors should be provided, having regard to:- (a) the nature of the traffic (b) the proximity of any existing detectors, (c) physical characteristics of the route (e.g. long tunnels), (d) the presence of signal boxes and other locations where staff are required to observe the passage of trains. R A I L T R A C K 3

6 Page 4 of 5 Withdrawn Document Appendix A (Code of Practice) 1. Operational Siting Criteria 1.1 Where detectors are required they should be sited at intervals of between 20 and 30 miles. 1.2 Each detector should be sited so that a train which activates it may subsequently be stopped by the display of a normal signal aspect sequence. 1.3 Detectors should not be sited at locations where trains are normally braking or are at a stand, or where conductor shoe arcing is known to occur, or where a tunnel, viaduct or other hazardous feature would exist between the detector and the detachment point. 1.4 At the initial stopping point, where the train is examined by the traincrew, a suitable walking surface should be available on both sides of the train for the traincrew to carry out the examination. The walking surface should be as long as the longest train. Consideration should be given to the suitability of the site to cater for the possibility of the emergency services being required to attend, and should not therefore involve difficult access (e.g. viaduct, deep cutting or high embankment). 1.5 Where a detaching point is provided ahead of a detector, access to this location should be available for technical examination and repair. 2. Technical Siting Criteria 2.1 The site must be on straight track and sufficiently far from curved/canted track, rail joints or pointwork to minimise the risk of false alarms. 2.2 Power supplies and transmission arrangements appropriate to the equipment should be available. 2.3 The site should have suitable access for equipment maintenance purposes. 4 R A I L T R A C K

7 Page 5 of Vandal - prone sites should be avoided. 2.5 Lines on an east/west axis should be avoided if practicable because of the effect of the sun s rays. R A I L T R A C K 5