The Keisei 3700 series (京成3700形) is a commuter electric multiple unit (EMU) train type operated by the private railway operator Keisei Electric Railway in the Tokyo area of Japan since 1991.[1]
The 3700 series eight-car sets operate on the Keisei Main Line between Keisei Ueno and Narita Airport, including inter-running services over the Toei Asakusa Line and Keikyu Main Line to and from Haneda Airport through the Keikyu Airport Line,[1] with occasional use on services on the Keikyu Kurihama Line.[2] As of November 2014[update], the six-car sets are used solely on the Keisei Main Line.[1]
As of 1 March 2022[update],[3][4] the fleet consists of 10 eight-car sets and three six-car sets. The sets are formed as follows,[5] with car 1 at the Narita Airport end.
Six-car sets 3828 and 3838 are formed as shown below, with four motored ("M") cars and two non-powered trailer ("T") cars.[5]
The two M1 cars are each fitted with two single-arm pantographs.[5]
The eight-car sets are formed as shown below, with six motored ("M") cars and two non-powered trailer ("T") cars.[5]
The two M1 cars are each fitted with two pantographs, and the M1' car is fitted with one pantograph (cross-arm type for sets 3708 to 3818 and single-arm type for sets 3848 to 3868).[5]
Seating consists of longitudinal bench seating throughout.[1]
The first 3700 series sets were introduced in 1991, replacing the original 3000 series trains.[1] The first six-car sets were delivered in 2000.[1] Sets from the 6th batch onward (set 3828 onward) had restyled front ends with the headlights located near the roof. Two eight-car sets (3808 and 3748) were leased to the Hokuso Railway becoming Hokuso 7300 series sets 7808 and 7818, supplementing the two 7300 series sets owned by the Hokuso Railway.[5]
In 2017, eight-car set 3738 was converted and renumbered to become Chiba New Town Railway 9800 series set 9808, owned by the Chiba New Town Railway and operated by the Hokuso Railway.[6]
Eight-car set 3778 was transferred to the Hokuso Railway, becoming 7300 series set 7828. The transferred set began revenue service with the Hokuso Railway on 26 February 2018.[7]
In December 2021, eight-car set 3768 was leased to the Hokuso Railway and became 7300 series set 7838.[4] In addition, 7300 series set 7818 was returned to Keisei; it regained its original set number (3748) and was shortened to a six-car formation.[3]