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New safety system for Stewarts Lane Depot


Sheffield company Zonegreen has finished work on a safety systems project for Govia Thameslink Railway (GTR) at its Stewarts Lane depot in Battersea, London.

Zonegreen’s Depot Personnel Protection System (DPPS) system is designed to control the movement of trains into the facility, using a derailer, and provide audio and visual warnings to staff working nearby. When staff log in as working in the area, the derailer prevents trains putting them at risk.

This is the latest configuration of the firm’s DPPS system. Installed on 14 roads in the main shed, it replaces an older Programmable Logic Control (PLC) system and introduces radio-frequency identification cards to allow contactless logging in.

The system is designed to be configured using a drag-and-drop interface, whilst the upgraded RFID control panels, five years in development, have been independently certified to be EMC (electromagnetic compatibility) compliant , ensuring their radio frequency range will not interfere with other telecommunication or electrical devices.

GTR’s Stewarts Lane depot in Battersea has a long history in the housing and servicing of fleets using the UK rail network. Completed in 1862, it is now known for housing everything from the Pullman carriages used on the Venice Simplon Orient Express to the Class 387 electric units of the Gatwick Express fleet.

Christian Fletcher, Zonegreen.

Zonegreen’s technical director, Christian Fletcher, said: “At the heart of our protection system is the concept of ‘distributed intelligence.’ There is no master controller or signal point failures, which provides unprecedented reliability.

“We are pleased to see our RFID updates working so well at Stewarts Lane. DPPS is now even easier to operate, ensuring train movement is managed safely by removing the margin for human error.”

Zonegreen is currently designing new protection systems for depots in Brighton and Selhurst. The company has 20 years of experience, and – as well as installing systems in the UK – carries out work for clients globally.


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