The is a rapid transit line owned by the third-sector company Tà Âyà  Rapid Railway Co., Ltd., which runs between Nishi-Funabashi Station in Funabashi, Chiba and Tà Âyà Â-Katsutadai Station in Yachiyo, Chiba. The name comes from the characters for Tokyo and Chiba. The line functions as an extension of the Tokyo Metro Tà Âzai Line, with a through service between the two lines.
Of the 16.2km line, approximately 5.9 km (37%) is in underground tunnel, 9.5 km (59%) is on bridges (viaducts), and 0.8 km (4%) is on embankments.
Every train on the Toyo Rapid Railway (other than depot workings between Yachiyo-Midorigaoka and Toyo-Katsutadai) operates a through service with the Tokyo Metro Tà Âzai Line. However, as Tà Âyà  Rapid Railway rolling stock (the Tà Âyà  Rapid 2000 series) is not equipped with ATS-P, they must terminate at Nakano and cannot continue onto the Chà «à ÂâÂÂSà Âbu Line, which uses ATS-P. Similarly, the Chà «à ÂâÂÂSà Âbu Line's E231-800 series sets must terminate at Nishi-Funabashi as they lack the WS-ATC safety system the Tà Âyà  Rapid Railway Line uses. Tokyo Metro vehicles can operate on all three lines.
There are three train service types on the Tà Âyà  Rapid Railway, however all trains stop at every station the Tà Âyà  Rapid Railway Line. As such, the service type only refers to the stops made on the Tokyo Metro Tà Âzai Line.
Operates between Tà Âyà Â-Katsutadai and Nakano (the western terminus of the Tà Âzai Line), with some services extending to Mitaka. The majority of services on the Toyo Rapid Railway use this service. While it stops at every station on the Tà Âyà  Rapid Railway Line, the section between Nishi-Funabashi and Tà Âyà Âchà  on the Tokyo Metro Tà Âzai Line is non-stop except for a stop at Urayasu, then the service stops at all stations west of Tà Âyà Âchà Â. Most morning and afternoon trains go direct to Mitaka on the Chà «à ÂâÂÂSà Âbu Line.
Like the Rapid Service, it also operates between Tà Âyà Â-Katsutadai and Nakano stations and in the morning and afternoon to Mitaka, and stops at every station on the Tà Âyà  Rapid Railway Line. Only operates in the "up" direction on mornings towards Nakano. It is non-stop between Nishi-Funabashi and Urayasu before stopping at every station west of Urayasu.
This service only operates on rush hours when services on the Tokyo Metro Tà Âzai Line make through services with the Tà Âyà  Rapid Railway Line, and sometimes goes to Mitaka station on the Chà «à ÂâÂÂSà Âbu Line. This service stops at all stations on the Tà Âyà  Rapid Railway Line, Tokyo Metro Tà Âzai Line and the Chà «à ÂâÂÂSà Âbu Line.
From the revised timetable on the 4 December 1999, the "Toyo Rapid" service was created. It stopped at Nishi-Funabashi, Kita-Narashino, Yachiyo-Midorigaoka and Tà Âyà Â-Katsutadai. Due to congestion on tracks, on March 14, 2009, the timetable changed to have 4 evening "up" bound Tà Âyà  Rapid trains, thus the "down" service towards Tà Âyà Â-Katsutadai was abolished. Due to passenger counts increasing on stops that the Tà Âyà  Rapid did not stop at, the Tà Âyà  Rapid service was completely abolished on the March 14, 2014 timetable change.
Construction work on the line commenced in July 1984, and the line was fully opened on 27 April 1996. Limited-stop services were introduced on the line from the start of the 4 December 1999 timetable revision. Such services in the "up" direction (toward Tokyo) were discontinued in 2009, and the "down" limited-stop services were discontinued from the start of the revised timetable on 15 March 2014.
This article incorporates material from the corresponding article in the Japanese Wikipedia.