The TX-2000 series (TX-2000系) is a dual-voltage electric multiple unit (EMU) train type operated by the Metropolitan Intercity Railway Company on the Tsukuba Express line in the Kanto region of Japan since 2005.

(The DC-only TX-1000 series sets are restricted to the Akihabara – Moriya section of the line.

[4] The first six-car prototype was built in March 2003, and 15 more sets were subsequently delivered from Hitachi between January and July 2004, entering service on 24 August 2005.

[2] A further three six-car sets were delivered in June and August 2012 to provide additional capacity.

[2][5] These three sets, 71 to 73, feature a number of design improvements over earlier sets, including the use of LED interior lighting, increased seat thickness, and opening windows to provide ventilation at the ends of cars.