|Class 955 "300X"|
Preserved car 955-6 at Hamamatsu Works, July 2010
|Manufacturer||Hitachi, Kawasaki Heavy Industries, Mitsubishi Heavy Industries, Nippon Sharyo|
|Number built||6 vehicles|
|Number in service||None|
|Number preserved||2 vehicles|
|Number scrapped||4 vehicles|
|Line(s) served||Tōkaidō Shinkansen|
|Car body construction||Aluminium alloy|
|Car length||27,150 mm (89 ft 1 in)
(end cars), 25,000 mm (82 ft 0 in)
|Width||3,100 mm (10 ft 2 in)|
|Height||3,300 mm (10 ft 10 in)|
|Maximum speed||350 km/h (217 mph) (nominal)|
|Traction system||500 kW (670 hp) motors
(4 per car)
|Power output||12 MW (16,000 hp)|
|Electric system(s)||25 kV AC, 60 Hz|
|Current collection method||Overhead catenary|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in)|
"300X" was the name given to the Class 955 (955形?) 6-car experimental Shinkansen train developed in 1994 by the Central Japan Railway Company (JR Central) in Japan to test technology to be incorporated in future shinkansen trains operating at speeds of 300 km/h (186 mph) or higher.
Manufacture of the train was shared among four different manufacturers, with a number of different body construction methods used. The two ends cars employed differing nose designs, and a number of pantograph shroud designs were tested over the lifetime of the trainset.
This vehicle was constructed by Nippon Sharyo using large hollow aluminium extrusions, similar to car 2, and was equipped with large side doors for installing and removing test equipment.
Hitachi-built end car with "wedge" nose design. The body was constructed of brazed aluminium honeycomb panels.
The train was unveiled on 22 December 1994.
Test-running on the Tōkaidō Shinkansen was delayed by track damage caused by the Great Hanshin earthquake in January 1995, but full-scale test-running commenced on 25 May 1995, between Maibara and Kyoto.
On 21 September 1995, the Class 955 train recorded a maximum speed of 354.1 km/h (220.0 mph) on the Tōkaidō Shinkansen between Maibara and Kyoto.
On 11 July 1996, the train recorded a maximum speed of 426.6 km/h (265.1 mph), exceeding the previous national speed record of 425.0 km/h (264.1 mph) set in December 1993 by JR East's Class 952/953 "STAR21" experimental train.
On 26 July 1996, the train recorded a Japanese national speed record of 443.0 km/h (275.3 mph) on the Tōkaidō Shinkansen between Maibara and Kyoto. This record still stands as of May 2011.
The Class 955 trainset was officially withdrawn on 1 February 2002.
End car 955-1 is preserved outdoors at the RTRI large-scale wind tunnel test facility in Maibara, Shiga. End car 955-6 was initially preserved inside JR Central's Hamamatsu Works, and was moved to the new SCMaglev and Railway Park in 2010.
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