WESTINGHOUSE has begun a year-long field trial of its Surelock points drive machine at Stratford Market depot on London Underground’s Jubilee Line. PPP contractor Tube Lines plans to use Surelock in the resignalling of Stanmore station during 2006.

According to Westinghouse, Surelock has a mean time between failures of 30 months and a mean time to repair of 15min. The linear backdrive provides positive locking of the closed switch rail against the running rail throughout its length, maintaining a minimum flangeway for the open switch rail.

Suitable for mounting either outside or between the rails, the manufacturer says Surelock can be used with all current switch types, providing run-through protection and electrical detection for main lines and metro use. Within the flood-resistant enclosure are four independently-replaceable modules containing the motor, drive assembly, escapement and controls, with a total weight of 151 kg.

Westinghouse Rail Systems, UK