Extended Block Working

Extended Block Working enables a driver to pass two or more main main aspect stop signals at danger where signalling equipment on a TCB line other than a single line fails or is disconnected.

Extended Block Working must apply between:

• an entrance signal kept at danger on the approach to the affected area, and

• an exit signal, that can be replaced to danger from the signal box, at a suitable location easily identifiable by a driver, beyond the affected area.

Where possible, the exit signal should be located at a place such as a station, level crossing, tunnel or junction.

Before Extended Block Working commences, the signaller must arrange for an ‘end of degraded working’ sign to be provided at the exit signal.

See image at end of page.

However, Extended Block Working can be introduced before the sign is provided at the exit signal, as long as the exit signal is located next to ("immediately before, at, or immediately beyond" a:

• station

• level crossing

• tunnel, or

• junction.

• Stop at the entry signal

• Signaller advises that Extended Block Working is in place and the location to which you must proceed

• Signally advises whether 'end of degraded working' sign has been provided

• You complete Extended Block Working Ticket (NR3190 - see below)

• You are given authority to pass entry signal at danger

• Tell guard, operate TPWS temporary isolation

• Max speed 50mph (50mph over points unless instructed)

• Disregard intermediate signals, stop at exit signal

If you are the first train to enter an Extended Block Working section you must:

• approach all points and crossings at caution

• check that they are in the correct position

• not pass over any of these points or crossings at more than 15 mph

You must proceed at caution if you have entered the Extended Block Working section to:

• examine the line

• remove a train or vehicles that have proceeded without authority

• assist a failed train

• remove a portion of a divided train

• evacuate passengers from a failed train.

You must not complete an Extended Block Working Ticket if your train is to enter the section to:

• remove a train or vehicles that have proceeded without authority

• assist a failed train

• remove a portion of a divided train

• evacuate passengers from a failed train.

• Stop at the signal

• Immediately reinstate TPWS

• Report to the signaller that your train has arrived

• cancel the Extended Block Working Ticket by writing the word ‘CANCELLED’ across it

• obey the signaller’s instructions for resuming normal working.