Safety Requirements of Signal Post Telephone Systems

Transcription

1 GK/RT0186 Safety Requirements of Signal Post Telephone Systems Synopsis This standard describes the mandatory requirements for the provision of, or alterations to, signal post telephone systems. Signatures removed from electronic version Submitted by Jon Melmoth Nominated Responsible Manager Approved by Philip Wiltshire Chairman, Train Control and Communications Subject Committee Authorised by M. H. Walter Controller, Safety Standards This document is the property of Railtrack PLC. It shall not be reproduced in whole or in part without the written permission of the Controller, Safety Standards, Railtrack PLC. Published by Safety & Standards Directorate, Railtrack PLC, Floor 2, Fitzroy House, 355 Euston Road, London NW1 3AG Copyright 1996 Railtrack PLC

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3 Safety Requirements of Signal Post GK/RT 0186 Page 1 of 5 Contents Section Description Page Part A Issue Record 2 Responsibilities and distribution 2 Compliance 2 Health and Safety Responsibilities 2 Supply 2 Part B 1 Purpose 3 2 Scope 3 3 Definitions 3 4 General 3 5 Reliability 3 6 Operational Safety Requirements 4 7 Signal Box Equipment 4 8 Testing and Commissioning 4 9 Application to Existing Systems 4 References 5 RAILTRACK 1

4 GK/RT0186 Page 2 of 5 Uncontrolled When Printed Safety Requirements Of Signal Post Part A Issue Record This standard will be updated when necessary by distribution of a complete replacement. Amended or additional parts of revised pages will be marked by a vertical black line in the adjacent margin. Issue Date Comments 1 October 1996 This standard supersedes TI/TTEL9031 Responsibilities and Distribution This standard shall be complied with by all personnel who are involved with the provision, installation, alteration, commissioning and maintenance of signal post telephone systems. Compliance The provisions of this are mandatory and must be complied with for new installations and changes to existing systems from 1st February The provision of a facility which enables the signaller to call the SPT is not mandatory for alterations to existing systems where this facility is not currently provided. The review and production of remedial action plans shall be completed by 6th December Health and Safety Responsibilities In issuing this Standard, Railtrack PLC makes no warranties, express or implied, that compliance with all or any s is sufficient on its own to ensure safe systems of work or operation. Each user is reminded of its own responsibilities to ensure health and safety at work and its individual duties under health and safety legislation. Supply Controlled and uncontrolled copies of this Standard may be obtained from The Catalogue Secretary, Safety and Standards Directorate, Railtrack PLC, Floor 2, Fitzroy House, 355 Euston Road, London, NW1 3AG. 2 RAILTRACK

5 Safety Requirements of Signal Post GK/RT 0186 Page 3 of 5 1 Purpose 2 Scope 3 Definitions 4 General Part B The purpose of this standard is to define the safety requirements of Signal Post Telephone (SPT) systems. This standard applies to the provision of, or alteration to, all SPT systems. Handover The handover of a project to the maintenance facility. Infrastructure Controller The organisation that controls the railway infrastructure (Railtrack). Relevant Bodies All those directly involved with the specification, planning, design and implementation, or use of SPT systems (this may include suppliers, service providers, and users). Signal Post Telephone System A system provided to enable secure communication between lineside signals and the associated signal box. Test Engineer The engineer responsible for the production and implementation of a test plan, and who is competent as specified in GK/RT Test Plan A document that details the requirements for testing, covering resources, timescale, test specification, inspection, schedule of tests and responsibilities. Principles and guidance for the provision of SPT communication systems are given in HM Railway Inspectorate Railway Safety Principles and Guidance. All new SPT systems and changes to existing installations shall comply with the Principles and Guidance and GK/RT The Infrastructure Controller shall be responsible for ensuring that: The safety requirements of any new or altered system are used to identify all relevant bodies, and the results are formally documented. Documented liaison takes place with all identified relevant bodies. All equipment has Railtrack type approval. 5 Reliability The Infrastructure Controller shall be responsible for ensuring that availability targets are specified on the basis of a suitable and sufficient risk assessment, the results of which shall be recorded. The risks of the system or a communication channel being unavailable shall be reduced to a level which is as low as reasonably practicable. The risk assessment shall include consideration of the need to set limits for the mean time between failures taking into account the environment in which the system and equipment must operate. RAILTRACK 3

6 GK/RT0186 Page 4 of 5 Uncontrolled When Printed Safety Requirements Of Signal Post 6 Operational Safety Requirements SPT systems shall be designed to ensure that: Only one call can be established between the signaller and a remote party at any one time. 7 Signal Box Equipment 8 Testing and Commissioning 9 Application to Existing Systems No interruption by a third party shall be possible under normal working conditions. The level of overhearing shall be sufficiently low so as to eliminate the possibility of confusion with other calls. The unique identity of each telephone shall be presented to the signaller when an incoming call is received, and shall be maintained for the duration of the call. All systems must incorporate a facility which enables the signaller to call the SPT The Infrastructure Controller shall determine the provision and disposition of SPT system facilities inside the signal box and ensure that call indications are clear and unambiguous. New equipment or changes to existing facilities shall be tested prior to bringing into service. The Test Engineer shall produce a Test Plan to ensure that the system performs according to its specification and the safety requirements of the operational railway. The Test Plan shall, as a minimum, specify the tests to be undertaken, the competence requirements to undertake the tests, and the schedule for implementation. The Infrastructure Controller is responsible for ensuring that the Test Plan is formally authorised and implemented, and the results are recorded and retained On handover a completion certificate which certifies that the tests have been satisfactorily completed and that the system conforms to its specification shall be provided by the Test Engineer for formal acceptance and retention by the Infrastructure Controller. The Infrastructure Controller shall implement a review of all existing systems to ensure the requirements of this standard are met. Where non compliances are identified these shall be formally recorded. A remedial action plan shall be produced for each non compliance on the basis of a suitable and sufficient risk assessment, the results of which shall be recorded. Alterations to existing systems which involve the replacement of more than 25% of the telephones, or an increase in the existing number of telephones which exceeds 20%, shall normally require the provision of the facility which enables the signaller to call each SPT on the system. Any decision not to provide such facilities shall be made on the basis of a suitable and sufficient risk assessment, the results of which shall be recorded. 4 RAILTRACK

7 Safety Requirements of Signal Post References GK/RT 0186 Page 5 of 5 HM Railway Inspectorate GK/RT 0037 GK/RT 0101 Railway Safety Principles and Guidance Signal Sighting Competence Standards for S&T Staff RAILTRACK 5