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London Underground - SDO & CSDE

Tracklink Selective Door Opening & Correct Side Door Enabling System Application: Selective Door Opening & Correct
Side Door Enabling

Installation Area: London Underground

Client: London Underground

Hima-Sella was awarded a contract by Metronet Rail SSL (now owned by London Underground) for the design and supply of a selective door opening (SDO) and correct side door enabling (CSDE) system which will be used on the subsurface network at rail stations where platforms are shorter than the train, and ensures safe opening of the correct doors. (Read the detailed case study here).

The system will utilise Hima-Sella’s unique Tracklink III solution, which is the latest generation of Track to Train communication systems. The system comprises a passive beacon which is fixed to the platform, and train mounted equipment consisting of two antennas, Tracklink III reader and SIL2 programmable controller. The track side beacon sends information regarding which side the platform is on and which doors should be opened, depending on the platform’s length. This is received by the antenna and the reader and the information is processed by the controller which opens the corresponding doors. The Tracklink III antenna, reader and controller will be installed on 191new Bombardier trains and the passive trackside beacons will be fitted on the Circle, District, Metropolitan and City lines.

This is the latest Metronet contract awarded to Hima-Sella, after previously taking delivery of runback protection systems for use on the London Underground.

Please call our sales department on 0161 429 4500 or send an email to if you require more technical information such as data sheets, or to discuss any application you may be considering. Download Hima-Sella's transport infrastructure & mobile solutions brochure here.

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