Soviet State Beyer-Garratt Locomotives in Russia

Class Details by Steve Llanso of Sweat House Media

Class Ya - 01 (Locobase 738)

Data from Gavin Hamilton's excellent compilation of Garratt data posted at []

(6 September 2005).. Works number was 6737 in 1933.

Mountain Garratt purchased from the West at the same time US locomotive builders were supplying small batches of heavy freight engines. Likely reason was to sample Western steam-engine technology. Note the amount of superheater area and the sizable 305 mm (12") piston valves. J Bundell, commenting on a paper delivered by WC Williams in the Journal of the Institute of Locomotive Engineering in 1933 (as summarized by steamindex at [], accessed 5 December 2006), said that the superheater's large area was attributable to the very low ambient temperatures within which the Garratt had to operate.

An article (not directly sourced) from Mike's Railway History website -- [], accessed 8 December 2006 -- says that the boiler was so big it needed to be transported very slowly by truck from factory to dockside. On the subject of cold-weather operations, the article continues:"To guard against the intense cold of the Russian winter, all the external steam-pipes are arranged to drain off, so that there is no fear of water remaining in them and freezing them up. The cab, too, is lined throughout with wood to protect the enginemen against the frost. "

Principal Dimensions by Steve Llanso of Sweat House Media

ClassYa - 01
Locobase ID738
RailroadSoviet State
CountrySoviet Union
Number in Class1
Road NumbersR-01
Number Built1
BuilderBeyer, Peacock
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)32.50 / 9.91
Engine Wheelbase (ft / m)98.75 / 30.10
Ratio of driving wheelbase to overall engine wheelbase 0.33
Overall Wheelbase (engine & tender) (ft / m)98.75 / 30.10
Axle Loading (Maximum Weight per Axle) (lbs / kg)44,240 / 20,067
Weight on Drivers (lbs / kg)349,432 / 158,500
Engine Weight (lbs / kg)587,972 / 266,700
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)587,972 / 266,700
Tender Water Capacity (gals / ML)9731 / 36.86
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)17.60 / 16
Minimum weight of rail (calculated) (lb/yd / kg/m)73 / 36.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)59.10 / 1501
Boiler Pressure (psi / kPa)220.50 / 15.20
High Pressure Cylinders (dia x stroke) (in / mm)22.44" x 27.95" / 570x710 (4)
Tractive Effort (lbs / kg)89,268 / 40491.33
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.91
Heating Ability
Tubes (number - dia) (in / mm)246 - 2.008" / 51
Flues (number - dia) (in / mm)60 - 5.236" / 133
Flue/Tube length (ft / m)14.76 / 4.50
Firebox Area (sq ft / m2)235.64 / 21.89
Grate Area (sq ft / m2)85.54 / 7.95
Evaporative Heating Surface (sq ft / m2)3570 / 331.66
Superheating Surface (sq ft / m2)970 / 90.12
Combined Heating Surface (sq ft / m2)4540 / 421.78
Evaporative Heating Surface/Cylinder Volume139.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation18,862
Same as above plus superheater percentage22,822
Same as above but substitute firebox area for grate area62,870
Power L111,440
Power MT577.41

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