Most large metropolitan cities rely on integrated public transportation systems like buses, subways or railways to move people efficiently around. Transportation systems need to reliably run 24/7 no matter if it’s sunny, snowing or raining. Weather and harsh environments cause systems to slowly wear and deteriorate, and system malfunctions are unavoidable, but continuous system monitoring and maintenance can make systems operate longer and run more safely and reliably. Subway systems and tunnels can typically span hundreds of kilometers, so if one part malfunctions, it can be very difficult to diagnose the source of a problem. Without proper monitoring, control centers are powerless, and if problems occur during rush hours, it could be chaotic and dangerous.