Here's a 81-71M Class Metro train, originally built in the Soviet Union and based on Moscow Metro trains, the 81-71 Class have now been fully rebuilt with new seats and interiors, as well as modern electronics, making them 81-71M's. The 81-71 Class were not the first Prague Metro trains, though, as the first trains had been Ecs Class Metro trains similar to those now used in Budapest. The A (green) and B (yellow) lines now use them exclusively, while the C Line uses the new Seimens M1's.