The is an AC electric multiple unit (EMU) train type operated by Hokkaido Railway Company (JR Hokkaido) on Sapporo area suburban services in Hokkaido, Japan since 1996.
Formation , 21 three-car sets are in service, numbered G-101 to G121, and based at Sapporo Depot. The trainsets are formed as follows, with one motored intermediate car and two non-powered driving trailer cars.
Car No. 1 2 3 Designation Tc' M Tc Numbering KuHa 731-100 MoHa 731-100 KuHa 731-200 Capacity(total/seated) 141/50 151/52 143/50
Car 2 is fitted with one N-PS785 single-arm pantograph.
731 Series units are commonly known to run together with older 721 Series units.
Interior Seating consists of longitudinal bench seating throughout, without the vestibule areas used on the earlier 721 series trains.
History
A total of 63 vehicles (21 sets) were delivered to Sapporo Depot between 1996 and 2006. The first units entered service from 24 December 1996.
From the start of 22 March 1997 timetable revision, 731 series EMUs were operated in multiple with KiHa 201 series DMU sets over certain routes.
Polycarbonate window protectors were added in 2002, and the original pantographs were replaced with single-arm pantographs between 2004 and 2005.
Fleet history The individual build histories of the fleet are as follows. Set No. Manufacturer Delivery date G-101 Kawasaki Heavy Industries 12 December 1996 G-102 10 December 1996 G-103 Hitachi 13 December 1996 G-104 14 December 1996 G-105 Kawasaki Heavy Industries 23 February 1998 G-106 24 February 1998 G-107 G-108 22 March 1998 G-109 23 March 1998 G-110 24 March 1998 G-111 16 December 1998 G-112 17 December 1998 G-113 Hitachi 18 December 1998 G-114 19 December 1998 G-115 Kawasaki Heavy Industries 20 December 1999 G-116 G-117 21 December 1999 G-118 Hitachi 13 December 1999 G-119 G-120 Kawasaki Heavy Industries 6 March 2006 G-121 5 March 2006
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