Page "Train Protection & Warning System" Paragraph 18

An alternative to using derailers in Depot Personnel Protection Systems is to equip the system with TPWS.

This equipment safeguards staff from unauthorised movements by using the automatic safety equipment fitted to the driving cabs of all main-line registered traction and rolling stock in the UK.

Any unplanned movement will cause the train to automatically come to a stand when it has passed the relevant signal set at ' danger '.

This has the added benefit of preventing damage to the infrastructure and traction and rolling stock that a derailer system causes.

The first known installation of such an equipped system is at Ilford Depot.

Note: TPWS equipped depot protection systems would only be suitable for locations where vehicles are driven in and out of the maintenance building by a leading driving cab-they would not be suitable for use at a maintenance building that undertakes largely loose coaching stock or wagon maintenance, where vehicle movements are undertaken by a propelling shunting loco ( in this case the lead vehicles would not be equipped with the relevant TPWS safety equipment ).