London Underground faced the challenge of extending the service life of its Central Line and Bakerloo Line fleets while ensuring continued reliability, compliance, and improved passenger experience. The Central Line’s fleet of 85 eight-car trainsets, introduced between 1991 and 1994, required significant upgrades to key onboard systems, particularly the Data Transmission System and Passenger Information/Public Announcement (PIS/PA) system. These systems were outdated and no longer met evolving customer expectations or updated legislative requirements.
The original Data Transmission System for the Central Line was supplied by EKE-Electronics and Westinghouse Signals & Brakes during the fleet’s initial service entry. After decades of operation, replacing this system was a key priority to ensure continued performance and reliability.
Similarly, the Bakerloo Line’s 1972 stock trains, the oldest passenger trains still in service in Britain, required modernisation to maintain operational performance. London Underground aimed to upgrade the Train Control and Management System (TCMS) and PIS/PA system of the 1972 stock to meet customer expectations, comply with legislative requirements, and extend the fleet’s operational life. The refurbishment project, covering 252 metro cars, was essential to keeping the fleet in service until its planned retirement.
With the Central Line carrying over 260 million passengers annually and the Bakerloo Line serving 125 million, maintaining reliable service was critical. London Underground needed a solution that would seamlessly replace legacy systems while supporting the continued safe and efficient operation of both lines.