The urban and mass transit industry has a number of special requirements, all connected to the challenge that a system must be able to handle extremely high train density 24/7. That places a particular emphasis on having maximum uptime and reliability of all components in a train control system. Because this type of railroad maintains frequent and continuous operation, often in difficult environmental conditions, reliable equipment is essential to sustain operational availability.
Availability is also impacted by maintenance considerations, in particular the meantime to repair. The less time required for maintenance the better, but especially in the case of corrective maintenance which can interfere with scheduled operations during the repair cycle. The ideal train control system should deliver dual benefits of maximum uptime and maximum cost-efficiency.