The is an electric multiple unit (EMU) commuter train type operated by the Kyoto Municipal Subway in Kyoto, Japan, since 1997.
The 50 series was introduced in 1997 with 14 6-car sets built by the end of 1997 to coincide with the opening of the Tà Âzai Line. The remaining 18 cars (3 sets) would be built in 2004 for the opening of an extension from Rokujizà  Station to Daigo Station.
The trains are smaller than most other trains in the country because of the smaller tunnels carved out during construction.
Passenger accommodation consists of longitudinal bench seating throughout. Priority seating and wheelchair space is provided on all vehicles.
The six-car trains are formed as follows, with four motored ("M") cars and two non-powered trailer cab ("Tc") cars.