scope:

General section

What this book is for

This book provides a general overview of:

• possession protection methods

• the arrangements for passing engineer's trains and mechanised vehicles into and out of a possession

• special traction current arrangements for a possession.

It details the responsibilities of the different activities involved in providing safe and efficient protection for a possession.

This book covers the principles associated with protecting a possession. It gives details of:

• how to get permission to take and give up the possession

• how to define the possession limits

• how to implement and remove the protection

• how to pass engineer's trains into, through and out of a possession

• how to move a mechanised vehicle into and out of a possession

• the special traction current arrangements, isolations and short circuits.

This book gives the steps that need to be followed to safely implement the protection.

Who needs this book

You will need this book if you are planning, managing, protecting or working in a possession on London Underground's (LU) operational infrastructure.

You will also need this book if you are providing technical support functions associated with:

• the possession protection

• the operation of engineer's trains or mechanised vehicles

• undertaking special traction current arrangements.

You will need this book if you are carrying out the activities of:

• a controller

• a signaller

• a track access controller

• a power control room operator

• Access Reservation Agency staff

• a station supervisor (but only at a station where protection key switches are provided)

• an engineer's train operator or train operator (of secured train).