NR/SP/SIG/10138 : ISSUE 3

1 Purpose
2 Scope
3 Reference Documentation
4 Definitions
5 General Requirements
6 Train Stops At Signals And Stop Boards
7 Overspeed Seniors At signals
8 TPWS + Requirements and Positioning
9 Overspeed Sensors At Speed Restrictions
10 Overspeed Sensors At Buffer Stops
11 Limitations On Positioning Of Transmitter Loops
Appendix A - Limitations On The Positioning Of Train Stops
             and Overspeed Sensor Transmitter Loops
Appendix B - Positioning Of Train Stops And Overspeed
             Sensor On Bi-Directionally Signaled Lines
Appendix C - Flowchart 1 - Determination Of Requirements
             For OSS At Signals
Appendix D - Flowchart 2 - Positioning Of OSS At Signals -
             Plain Line Approaches
Appendix E - Flowchart 2 - Positioning Of OSS At Signals -
             Complex Approaches
Appendix F - Flowchart Final Selection And Loop Positioning
             For OSS At Speed Restrictions
Appendix G - Data Tables Previously Used in TPWS/TI/014 For
             PSR Loop Positioning

Covers the requirements for and positioning of TPWS Transmitter Loops at signals, speed restrictions and buffer Stops, at which the provision of TPWS is necessary to meet the requirements of the Railway Safety Regulations 1999 ('the Regulations').