The planning and development of the entire control system for the subway and suburban railway network in Warsaw was carried out by the Faculty of Transport at the Warsaw University of Technology in co-operation with Kontron. The world-renowned ‘Remote Control and Supervisory System’ was first installed in 1994. The subway system has expanded rapidly and so too has the control technology. A distinctive technical achievement for rail transport safety is the computer interlocking system, which complies with SIL-4, the highest railway safety standard. This guarantees the correct interaction of more than 3,000 real-time I/Os. The hardware configuration will be available for years on end and offers an extremely high MTBF.