Overspeed protection system on London trams awarded SIL2

Article: Overspeed protection system on London trams awarded SIL2

The safety system installed on London Trams network to prevent the overspeeding of trams receives Safety Integrity Level 2 (SIL2) certification. This SIL2 accreditation is a UK first for a light rail overspeed protection system and provides independent safety assurance.

(Derby, 22nd of March 2023) In January 2019, DB ESG was selected by Transport for London, following a competitive tendering process, to develop, design, install and commission a device to physically prevent the overspeeding (PPOS) of light rail vehicles operated by London Trams in the Croydon area. DB ESG collaborated with Sella Controls who provided the hardware and software, including a PPOS controller and Tracklink III system.

This system has been fully operational for over a year, during which time it has demonstrated exceptional performance, with 100 per cent availability and zero system failures over this time. In February 2023, the Independent Safety Assessor certified the overspeeding protection system, including both the hardware and the software, as being safety assured at Level 2 (SIL2).

Commenting on this success, Nick Goodhand, Managing Director, DB ESG said: “We are absolutely delighted that this system has received this mark of safety quality. Protecting a tram network with the highest possible level of safety gives operators the peace of mind that they are doing their uttermost to keep their passengers safe. “

Chris Elliott, Business Development Director for SELLA CONTROLS added: “The successful delivery of the PPOS solution to London Trams is a fantastic achievement for us and our partners in this project, DB ESG and Transport for London. Knowing that we have implemented a solution that will provide our client with the highest level of safety for its tram network is of the upmost importance. As a passenger it is good to know that safety is at the forefront of London Trams’ operation.”

About DB ESG: DB ESG plays a significant role in the development of the UK’s rolling stock, offering innovative and value-led advice, technical consultancy and technology integration.

We work across the rail industry with train operators, vehicle owners, manufacturers, system and component suppliers. With an experienced team of proven railway designers, mechanical and electrical systems engineers, project managers and consultants that are ready to address all industry challenges.

DB ESG, as part of DB Systemtechnik, combine to form the largest railway rolling stock technology consultancy in Europe and is the route to market for DB Systemtechnik’s products and services.

For further information visit: www.deutschebahn.com/dbesg

About Sella Controls: Sella Controls is recognised as a market leader in ‘engineered solutions’ for safety, control, automation and telecommunication applications in the oil & gas, petrochemical, rail, steel and power industries. Current services include completely integrated systems, panel building, sub-assemblies, product development and on-site support.

Recent multi-million pound contracts won by Sella Controls in the rail sector include the supply of a new Traction Power SCADA System for Docklands Light Railway, Safety PLC Depot Control Solutions, PPOS Solutions and extensive works for Network Rail as part of the Safer Isolations program. Sella Controls are an integrator of Mitsubishi, Panorama, Honeywell and ICONICS products as well as a supplier of HIMA Safety Systems.

The company is headquartered in Ashby de la Zouch with regional offices in Cheshire, Leicestershire and Aberdeenshire. In total, Sella Controls employs more than 125 full-time personnel and has a turnover in excess of £12million. The company's quality management system has been approved to BS EN ISO 9001 since 1989.

For further information visit: www.sellacontrols.com