Electric depots in the Moscow Metro work as garages where trains are parked at night and where they arrive for repairs in case of breakdowns. As the number of lines in the Moscow Metro increases, the number of trains running on them also increases proportionally. It is necessary to keep the existing interval of movement of trains - in "rush" hours it makes 30 seconds. By the way, no other subway system in the world has been able to achieve such a record-breaking figure.