The Tobu 50000 series (東武50000系, Tōbu 50000-kei) is a DC electric multiple unit (EMU) commuter train type operated by the private railway operator Tobu Railway in Japan since March 2005, manufactured by Hitachi to its "A-train" concept. The trains represent the first use of aluminium body cars on Tobu commuter trains. They are also the first Tobu trains to feature bilingual (Japanese and English) automated passenger announcements.