Migration is the staged process of changing from the existing signalling system to the new TBTC system for the Jubilee and Northern Lines. As each phase of migration is introduced, a new boundary with the existing system is created and the boundary from the previous phase is removed. Trains retain their existing protection system (TCP mode) during the migration phases so that they can continue to operate in LU territory.

Migration Phases – JL

J2.0 – STR to CAT
J3.0 – CAT to WES

J4.0 – WES to DOH
J5.0 – DOH to STA

MIGRATION BOUNDARIES – JL

MIGRATION BOUNDARIES

Existing System 

Passive Installation Data

Passive Installation – Control

Passive Installation – Control 1

Commission Change Over Cubicle

Night / Weekend Testing of TBTC 

TBTC Commissioned 

TBTC Commissioned 1

Change over cubicle (COC)

1. COC is required to facilitate the migration of the SelTracsystem onto the Jubilee and Northern line.

2. The purpose of the COC is to facilitate testing and commissioning activities during the migration phase of the JNUP by rapidly switching between the two signalling systems in a safe manner.

3. COC will be implemented throughout the JL to migrate all existing wayside equipment like Points control & Detection, Train stops Control & Detection, PDIU, RGI, COLR’s, Floodgates etc. that will be controlled via the new TBTC system.

Change over cubicle (COC) 1

Change over cubicle (COC) 2

Change over cubicle (COC) 3

Remote COC SER/IMR Indications

Schematic COC Arrangements

Cut in Design

Cut in Design 1  

Cut in Design 2