|Manufacturer||Kawasaki Sharyo, Nippon Sharyo|
|Number built||2 vehicles|
|Number preserved||1 vehicle|
|Number scrapped||1 vehicle|
|Capacity||40 seated (Car 951-1)|
50 seated (Car 951-2)
|Car body construction||Aluminium alloy|
|Car length||25,000 mm (82 ft 0.25 in)|
|Width||3,386 mm (11 ft 1.31 in)|
|Doors||2 sliding doors per side|
|Maximum speed||250 km/h (155 mph) (nominal)|
|Traction system||250 kW (340 hp) x 8|
|Power output||2,000 kW (2,700 hp)|
|Electric system(s)||25 kV AC, 60 Hz overhead catenary|
|Current collector(s)||Cross-arm type pantograph|
|Track gauge||1,435 mm (4 ft 8+1⁄2 in) standard gauge|
The Class 951 (951形) was an experimental Japanese Shinkansen train built to test the technology for future high-speed trains operating at speeds of up to 250 km/h (155 mph) following the opening of the Tokaido Shinkansen in 1964.
The Class 951 train was a two-car unit formed of cars numbered 951-1 and 951-2. Car 951-1 was built by Kawasaki Sharyo (present-day Kawasaki Heavy Industries), and had a seating capacity of 40 with seats arranged 3+2 abreast. Car 951-2 was built by Nippon Sharyo, and had a seating capacity of 50, also with seats arranged 3+2 abreast.
Both cars were fitted with a cross-arm type pantograph at the inner end. Both were based on the PS200 type used on the 0 Series Shinkansen trains, but the pantograph on car 951-1 was designated PS9010K, and that on car 951-2 was designated PS-1010A. Normally, only the pantograph on car 951-2 was used.
The train was unveiled to the press on 26 March 1969, with formal test running commencing on the Tōkaidō Shinkansen from 2 July 1969.
On 24 February 1972, the Class 951 recorded a world speed record of 286 km/h (178 mph) on the Sanyo Shinkansen between Himeji and Nishi-Akashi, breaking the previous record of 256 km/h (159 mph) set by the Class 1000 Shinkansen.
The train was formally withdrawn on 11 April 1980. Car 951-2 was transferred to the Railway Technical Research Institute in Kokubunji, Tokyo, where it was used for roller rig testing. Car 951-1 was donated to the nearby Hikari Plaza Community Centre in 1994, where it is open to the public. Car 951-2 was subsequently stored out of use inside the Railway Technical Research Institute, and was cut up in 2008.