The Minatomirai 21 Line (ã¿ãªã¨ã¿ãÂÂãÂÂ21ç· Minato-mirai-21-sen), commonly known as the Minatomirai Line (ã¿ãªã¨ã¿ãÂÂãÂÂç· Minatomirai-sen), is a subway line in Yokohama, Japan that runs from Yokohama Station to Motomachi-Chà «kagai Station through the Minatomirai 21 business district. The line opened in 2004 and is operated by the Yokohama Minatomirai Railway Company.
Maps and station numbering use navy blue and the route symbol MM to identify the line. The entire line is underground and goes under the Minato Mirai and Kannai districts, as well as numerous islands made of soft reclaimed land and channels, requiring stations to be constructed deep underground. The original above-ground section of the Tà Âkyà « Tà Âyoko Line between Yokohama and Sakuragichà  stations was abandoned and replaced with a new underground connector line to allow through services onto the newly completed Minatomirai Line.
All trains run from Yokohama Station to Motomachi-Chà «kagai Station and vice versa, with no trains stopping and changing direction at any station in between.
Operations are managed by Tokyu Railways, with no changing of staff at Yokohama Station; Tokyu staff (train drivers and conductors) continue to support the train over the Minatomirai portion of the line as well. Station-side staffing is provided by Minatomirai employees with the exception of Yokohama Station, which is managed by Tokyu Railways. Many Minatomirai employees are former employees of Tokyu Railways. Train management is controlled by Yokohama Minatomirai Railway Company at an operational command center. Railway facilities are maintained by Yokohama Minatomirai Railway, but the actual maintenance work is contracted to Tokyu Railways employees. Because Yokohama Minatomirai Railway does not own its own rail yard, trains are parked overnight at Tokyu Railways' Motosumiyoshi Rail Yard and at Motomachi-Chà «kagai Station. There are plans to construct a portion of track for parking additional trains underneath Harbor View Park starting in 2020.
The Minatomirai Line is essentially an extension of the Tà Âkyà « Tà Âyoko Line. The two lines operate as one, with no crew change at Yokohama station where trains cross between the two lines, in contrast to standard procedure with other line operators in Japan.
With the completion of the underground link line to the Tokyo Metro Fukutoshin Line on March 16, 2013, Minatomirai Line trains run onto the Fukutoshin Line via the Tà Âkyà « Tà Âyoko Line and beyond to the Tà Âbu Tà Âjà  Line, Seibu Yà «rakuchà  Line, and Seibu Ikebukuro Line. Along with the link to the Fukutoshin Line being established, Tà Âkyà « Tà Âyoko and Minatomirai express trains (limited express/commuter limited express/express) were expanded from eight-car to ten-car configuration (with the exception of a portion of regular express trains). Platforms were extended at Minatomirai stations receiving express trains in order to be able to accommodate the extended ten-car configuration. Regular trains stopping at each station on the line continue to operate in the eight-car configuration.
All regular trains on the Minatomirai Line use the same services as the TÃ Âyoko Line.
The S-train is the first service on the Minatomirai Line with fully reserved seating. On weekends and holidays it makes two and a half round trips (to Motomachi-Chà «kagai Station twice and from the same station three times). All trains continue to the Seibu Ikebukuro Line, and one round trip begins and ends at the Seibu Chichibu Line's Seibu-Chichibu Station. Within the Minatomirai Line, these trains stop at Minatomirai Station and Motomachi-Chà «kagai Station, but tickets are not sold for final destinations at these stations. S-train services use the Seibu 40000 series train exclusively.
trains run during daylight hours during the week and at all times excepting early morning and late night on weekends and holidays. All services are operated by 10-car sets. Limited express trains stop at Yokohama Station, Minatomirai Station, and Motomachi-Chà «kagai Station within the Minatomirai Line.
operate during the morning rush hour and in the evening on weekdays. The trains use 10-car sets and stop at all stations on the Minatomirai Line with the exception of Shin-Takashima Station. Many trains continue to the Fukutoshin Line via the TÃ Âyoko Line as Commuter Express services.
operate all day long. The trains stop at all stations on the Minatomirai Line with the exception of Shin-Takashima Station. Most daytime trains use 8-car sets, but 10-car sets may be used during peak hours in the morning and evening.
trains stop at all stations. 8-car sets are used to align with the Tà Âkyà «, Yokohama, and Tokyo Metro lines.
In conjunction with the Tokyu Tà Âyoko Line, the Tokyo Metro Fukutoshin Line, the Seibu Ikebukuro Line, and the Tà Âbu Tà Âjà  Line, the first car is a female-only car during certain times of the day to prevent sexual harassment.
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Construction of the line started in 1993, and the line was opened to the public on 1 February 2004.
The eight-car Tokyo Metro 10000 series entered service on the Minatomirai Line and Tokyu Toyoko Line from 7 September 2012.
On 13 March 2026 at 12:20 pm, due to an overhead line outage that occurred between à Âkurayama Station on Tà Âyoko Line and Minatomirai Station, two trains in both directions forcing to stop. Therefore, both Tà Âyoko Line and Minatomirai Line have been suspended for 9.5 hours before service resumed on all lines around 9:50 pm. As a result, the incident caused the cancellation of 297 trains in both directions, affected approximately 123,000 people.