Driving On

Dagan Bradbury talks about our DOO solution for the Elizabeth line.

Dagan Bradbury, Project Manager, L.B. Foster TEW Engineering explains: “Network Rail’s driver only CCTV stanchion presented us with a number of challenges. The structure needed to be robust enough to withstand the turbulence created by high speed trains, yet manoeuvrable enough to be lowered for maintenance without the need for costly special equipment."

"Our smart engineered solution was to incorporate a simple electronic mechanism that enabled the CCTV cameras to be lowered and serviced by maintenance staff on the platform. This is activated by a plug-in electronic actuator and for safety purposes can only be activated using our purpose designed plug-in control box. The result is being rolled out on Elizabeth line platforms across London."

The Retractable Mounting System (RMS) enables maintenance of DOO CCTV cameras at platform level, without the need for high level access equipment, possessions or isolations. The 24VAC cameras in operation are mounted at 750mm from the platform edge at a height of between 2.75m–3m from platform level. A maximum of two cameras (designated Camera A and Camera B) can be mounted on each RMS, which can be lowered from operational position for platform level maintenance 2.2m from the platform edge.

Lowering of cameras is facilitated by a retractable mounting arm, which is either stanchion or canopy mounted. The retractable mounting arm incorporates a 24VDC 500N linear actuator, which facilitates the lowering/raising of the cameras and sufficient force to lock the cameras rigid when in the operating/raised position. The retractable mounting arm can only be operated by the RMS control unit. This includes a test monitor and the facility to remotely focus and zoom the camera lens to allow set-up of the cameras without the need of accessing the camera in its operating/raised position.

For more information contact

Dagan Bradbury

dbradbury@lbfoster.com