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Keio 8000 series
10-car set 8712 in November 2021
In service	1992 – Present
Manufacturer	Nippon Sharyo, Tokyu Car Corporation
Replaced	5000 series
Constructed	1992 – 1999, 2009
Entered service	11 May 1992
Refurbished	2013 – 2019 (merging of 4-car and 6-car sets) 2013 – Present (traction system replacement)
Number built	245 cars (41 sets + 1 car)
Number in service	244 cars (27 sets)
Number scrapped	1 car (8728(I), accident damage)
Formation	8/10 cars per trainset (present) 4/6/8 cars per trainset (as built)
Fleet numbers	8701 – 8714 (10-car sets) 8721 – 8733 (8-car sets) Previously: 8701 – 8714 (6-car sets) 8801 – 8814 (4-car sets)
Capacity	143 (end cars) 154/155 (intermediate cars)
Operators	Keio Corporation
Depots	Wakabadai, Takahatafudō
Lines served	KO Keio Line
Specifications
Car body construction	Ivory painted steel (cab ends) Stainless steel (body)
Car length	20,000 mm (65 ft 7 in) (full length) 19,500 mm (64 ft 0 in) (body length)
Width	2,845 mm (9 ft 4.0 in) (full width) 2,770 mm (9 ft 1 in) (body width)
Height	4,055 mm (13 ft 3.6 in) (car without pantograph) 4,100 mm (13 ft 5 in) (car with pantograph)
Entry	Level
Doors	4 pairs of sliding doors per side
Wheel diameter	860 mm (34 in) [1]
Wheelbase	2,200 mm (87 in) (motored bogie) 2,100 mm (83 in) (trailer bogie) [1]
Maximum speed	110 km/h (68 mph) (service) 120 km/h (75 mph) (design)
Weight	131 t (129 long tons; 144 short tons)(4-car sets) 204 t (201 long tons; 225 short tons) (6-car sets) 259 t (255 long tons; 285 short tons) (8-car sets)
Traction system	GTO- VVVF
Power output	150 kW (200 hp) per motor
Acceleration	3.3 km/(h⋅s) (2.1 mph/s) (after high acceleration modification) 2.5 km/(h⋅s) (1.6 mph/s) (as built)
Deceleration	3.5 km/(h⋅s) (2.2 mph/s) (full-service braking) 4.0 km/(h⋅s) (2.5 mph/s) (emergency braking)
Electric system(s)	1,500 V DC overhead catenary
Current collector(s)	Pantograph
UIC classification	2'2'+Bo'Bo'+Bo'Bo'+Bo'Bo'+Bo'Bo+2'2'+2'2'+Bo'Bo'+Bo'Bo'+2'2' (0-subseries ten-car sets) 2'2'+Bo'Bo'+Bo'Bo'+2'2'+2'2'+Bo'Bo'+Bo'Bo'+2'2' (20-subseries eight-car sets)
Bogies	TS-823A/TS-824 [1] TS-1017/TS-1018 (sets 8732 and 8733 only) [1]
Braking system(s)	Electronically controlled pneumatic brakes with regenerative braking
Safety system(s)	Keio ATC
Coupling system	Shibata
Headlight type	Sealed beam
Seating	Longitudinal
Track gauge	1,372 mm (4 ft 6 in)

The Keio 8000 series (京王8000系) is an electric multiple unit (EMU) train type operated by the private railway operator Keio Corporation on commuter services in the Tokyo area of Japan since 1992.

Technical details

This section needs to be updated. Please help update this article to reflect recent events or newly available information. (October 2021)

• MT ratio
  • 0 subseries: 10-car set: 6M4T (six motor cars and four trailer cars; each motor car has four motors)
  • 20 subseries: eight-car set: 4M4T
• Motor output: 150 kilowatts (200 hp)
• Gear ratio: 6.07
• Drive mechanism: Parallel cardan
• Traction control system: GTO- VVVF
• Headlights: Sealed beam
• Destination indicators: roller-blind or 3-color LED
• Passenger information displays: 3-color LED (4 per car)
• Seating arrangement (intermediate cars): 4-7-7-7-4 on longitudinal bench seats

Body

The body is stainless steel. The front is steel.

Driver's cab

"T" shape one handle master-controller system. Analog (formerly digital^{[ citation needed]}) speedometer. TNS (Train Navigation System).

• Acceleration: 4 notch
• Deceleration: 7 notch + emergency

Formations

As of 1 April 2015 ^[update], the fleet consists of 14 ten-car sets and 13 eight-car sets (244 vehicles in total), formed as follows. ^[2]

• c=Driver's cab; T=trailer, M=motor

0-subseries ten-car sets

20-subseries eight-car sets

Interior

• 
  Interior of car in original condition
• 
  Priority seats of car in original condition
• 
  Interior of a refurbished car
• 
  Priority seats of a refurbished car
• 
  Interior of a renewal car
• 
  Priority seats of a renewal car
• 
  Driver's cab
• 
  Driver's cab with analog speedometer

History

The first 8000 series trains were introduced in 1992. ^[3]

Six-car and four-cars sets (and occasionally a pair of four-car sets) used to be operated on splitting services which separated and re-joined at Takahatafudō Station until 2006. From 2013 to 2019, all six- and four-car 0-subseries sets underwent a refurbishment program. Among several technical upgrades, the cabs of the two inner ends were removed to form 10-car sets. ^[3]

The 8000 series trains are used exclusively on Keio Corporation lines. Thus, unlike some other Keio trains, they do not continue past Shinjuku on to the Toei Shinjuku Line.

Set 8705F was involved on the October 2021 Tokyo attack.

Special liveries

Set 8713 received a special all-over green livery in September 2009 evoking the livery carried by the former 2000 series trains. ^[4]

• 
  Set 8713 in special all-over green livery in November 2021

References

Wikimedia Commons has media related to Keio 8000 series.