JNR class D51

Japanese State Railways - Series D51 ; SŽD-Series Д51 (D51)
	D51 200, one of the two D51 preserved in working order
Numbering:	JGR D51 1 - 949, 1101 - 1161 TRA DT651 - DT687 UNO → Korail D51101 - D51102 → ミカ 7 1 ・ 2 RŽD D51-1 - D51-30
Number:	1,184
Manufacturer:	several
Year of construction (s):	1936-1951
Retirement:	In Japan December 24th, 1975
Type :	1'D1 'h2
Gauge :	1067 mm ( cape track )
Length over coupling:	19.730 mm
Height:	3.980 mm
Empty mass:	78.37 t
Service mass:	125.77 t
Wheel set mass :	14.3 t
Top speed:	85 km / h
Indexed performance :	1280 PSi
Driving wheel diameter:	1400 mm
Impeller diameter front:	900 mm
Rear wheel diameter:	900 mm
Number of cylinders:	2
Cylinder diameter:	550 mm
Piston stroke:	660 mm
Boiler overpressure:	initially 14 bar, later 15 bar
Number of heating pipes:	94
Number of smoke tubes:	35
Heating pipe length:	5500 mm
Grate area:	3.27 m²
Radiant heating surface:	17.5 m²
Tubular heating surface:	147.4 m²
Superheater area :	41.4 m²
Evaporation heating surface:	168.8 m²
Water supply:	22 m³
Fuel supply:	10 t
Brake:	Compressed air
Train heating:	steam
Control:	Heusinger control
Coupling type:	Janney clutch

The class D51 locomotives ( Japanese 国鉄 D51 形蒸気機関車 , Kokutetsu D51-gata Jōki kikansha , about "steam locomotive of the D51 series of the state railway") were narrow-gauge steam locomotives of the Japanese state railway . A total of 1115 units were built for these from 1936, more for areas occupied by Japan and in 1951 the last two machines for Korea on behalf of the UN forces in the Korean War . The modern two-cylinder superheated steam locomotives with the axle formula 1'D1 'were designed for mixed service in front of passenger and freight trains on main lines. The last examples were not taken out of service until the end of the Japanese steam locomotive era in 1975.

Like most Japanese steam locomotives, they were designed by the chief developer of the state railways, Hideo Shima.

The locomotives that remained on Sakhalin were given the designation Д51 ( D51 ) of the Soviet Railways (SŽD).

history

The completely newly developed locomotives were conceptually based on the D50 series of the Japanese State Railways , which was procured in the 1920s , but turned out to be significantly larger and more powerful. Their designation goes back to the series scheme in Japan and explains the letter D for four driven axles, the numbers 5 and 1 are the series number. In Japan, the series designation is pronounced separately as デゴイチ , "De-go-ichi" ("D-five-one"). With the JNR , the series and serial number were separated by a space, with the SŽD with a hyphen. In the case of the four-digit serial number, the JNR was not separated from the series designation for reasons of space. The early machines with 14 bar boiler pressure are externally recognizable by the common cladding of all domes and were called D51s , for this design the nickname "Namekuji" ("nudibranch") quickly became established. The series version was given a normal boiler design with a pressure increased to 15 bar.

A striking feature of all locomotives are the spoked wheels and the boxpok drive wheels . Some examples of the D51 series received Giesl ejectors around 1960 .

A locomotive, the D51-22, is on display at the Yuzhno-Sakhalinsk station as a memorial. Another machine, the D51-4 , is in working condition at the Yuzhno-Sakhalinsk depot and transports special trains there.

The machines also ran in Taiwan , where they stayed after the island came under the control of the Chinese government . They were given the designation DT 650 .

Received vehicles

In addition to the vehicles mentioned, many vehicles have survived in Japan . The locomotives D51 200 of the Umekoji Steam Locomotive Museum Kyōto and the D51 498 of the JR East in the Takasaki depot are currently operational . The stationary exhibits include the D51745 machines in Hiroshima , the D51187 in Ehime Prefecture and the D51 488 on the premises of the Wako Museum in Yasugi .