The Challenge for Softech
On the Elizabeth line (formally known as Crossrail), between Shenfield and Liverpool Street, signalling location cases faced a myriad of challenges including earthing faults and a single power dependancy. The existing infrastructure utilized IT Class 1 radial feeders feeding BX650 supply, which did not comply with the requirements of BS 7671. Double end feeding of signalling power was provided to increase reliability in case of single power failure. Complicating matters, source records were scattered across various projects, making the consolidation of information and design production an arduous task.

Our approach prioritised safety, managing touch voltages and ensuring proper termination of CPCs. By securing necessary ODAs for source records, we seamlessly executed the migration to a Class II signalling power system, demonstrating both technical prowess and effective project management. In order to reduce the installation, test and commissioning cost and time, Softech incorporated special design considerations.


Feedback
“Softech have done a fantastic job…it has been a real pleasure working with them.”
Sean Tarpey
“Softech have done a fantastic job in delivering the full scope of work. The Crossrail Engineering Team found their work to be very thorough and it has been a real pleasure working with them.”