Seibu 401 series

The Seibu 401 series (西武401系) is an electric multiple unit (EMU) train type operated by the private railway operator Seibu Railway on commuter services in the Tokyo area of Japan from 1978 to 1997.

Seibu Railway
The first 401 series train was constructed in 1968, then known as 411 series. At the time before conversion. 411 series cars had the MT15E traction motors, in later years Seibu converted all 411 series cars to Seibu 401 series. MT15E traction motors were replaced with MT46-based Hitachi resistor-controlled motors. The last remaining trains were withdrawn in 1997.

Sangi Railway
401 series train sets were transferred to Sangi Railway in 1990. Among other Seibu EMUs sent to that railway, it's the only 2-car EMU series on Sangi Railway line.

Ohmi Railway

 * Ohmi 800/820 series - entered service in 1997 (820 series) and 1998 (800 series)
 * Ohmi 700 series - entered service in June 1998; withdrawn in 2019.

The 800 and 820 series conversion included modifications of the trains, so that they won't make contact with the station platforms.