Central Uruguay 4-4-4 Locomotives in Uruguay


Class Details by Steve Llanso of Sweat House Media

Class 38 (Locobase 6372)

Data from Vulcan Foundry catalogue, as reproduced on [] (26 November 2004); and "Bogie Tank Passenger Engine and Tender for the Central Uruguay Railway", Vulcan Foundry Locomotive Catalogue, No. 28, found on Flicker's Historical Locomotive Images website at []. (Many thanks to Jorge Cerezo Toledo for his 26 June 2021 email containing links to several sites including the Vulcan Catalogue referred to above.) Works numbers were 2830-2835.

The catalogue illustration shows a balanced suburban tank with short side tanks, large cab, Belpaire firebox, dome centered on the boiler, and a capped stack.

Principal Dimensions by Steve Llanso of Sweat House Media

Class38
Locobase ID6372
RailroadCentral Uruguay
CountryUruguay
Whyte4-4-4T
Number in Class6
Road Numbers38-43
GaugeStd
Number Built6
BuilderVulcan Foundry
Year1913
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)29.71 / 9.06
Ratio of driving wheelbase to overall engine wheelbase 0.24
Overall Wheelbase (engine & tender) (ft / m)29.71 / 9.06
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)68,320 / 30,989
Engine Weight (lbs / kg)139,440 / 63,249
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)139,440 / 63,249
Tender Water Capacity (gals / ML)1980 / 7.50
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.40 / 3.10
Minimum weight of rail (calculated) (lb/yd / kg/m)57 / 28.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)13,926 / 6316.73
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.91
Heating Ability
Tubes (number - dia) (in / mm)171 - 1.875" / 48
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.35 / 3.15
Firebox Area (sq ft / m2)94 / 8.73
Grate Area (sq ft / m2)17.50 / 1.63
Evaporative Heating Surface (sq ft / m2)963 / 89.47
Superheating Surface (sq ft / m2)205 / 19.04
Combined Heating Surface (sq ft / m2)1168 / 108.51
Evaporative Heating Surface/Cylinder Volume172.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2800
Same as above plus superheater percentage3304
Same as above but substitute firebox area for grate area17,747
Power L19391
Power MT606.08

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