Buenos Aires & Rosario 4-6-0 Locomotives in Argentina


Class Details by Steve Llanso of Sweat House Media

Class Serie M.4 (FCCA) (Locobase 3697)

Data provided by Carlos Alberto Fern+ndez Priotti in Bryan Attewell ([link] Steam Locomotive simulator program (April 2000).


Class unknown (Locobase 2720)

Data from Vulcan Catalogue, ca. 1920 preserved at website [link] (26 November 2004). See also "Compound Passenger Loco, Buenos Ayres [sic] Great Southern Ry," The Locomotive Magazine, Volume XII [12] (15 May 1906), pp.77-78; "Compound Locomotive for the Buenos Ayres [sic] & Rosario Ry", Volume 13 (15 July 1907), pp. 120-121; and "New Engines, Buenos Ayres Great Southern Ry," Locomotive Magazine, Volume 18 [XIII] (15 July 1912)

Very much the image of a British six-coupled of the same period, this two-cylinder compound design featured a Belpaire firebox, outside cylinders, and inside motion. Vulcan Foundry and Beyer, Peacock contributed engines to this class. See the LM report for a detailed description of the compounding system.

See Locobase 9924 for the superheated update of this class.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassSerie M.4 (FCCA)unknown
Locobase ID3697 2720
RailroadBuenos Aires & RosarioBuenos Aires & Rosario
CountryArgentinaArgentina
Whyte4-6-04-6-0
Number in Class5
Road Numbers454-458377
Gauge5'6"5'6"
Number Built5
BuilderKitson & Coseveral
Year18891904
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.58 / 4.14
Engine Wheelbase (ft / m)25.29 / 7.71
Ratio of driving wheelbase to overall engine wheelbase 0.54
Overall Wheelbase (engine & tender) (ft / m)49.46 / 15.08
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)74,526 / 33,804106,848 / 48,465
Engine Weight (lbs / kg)145,824 / 66,145
Tender Loaded Weight (lbs / kg)95,760 / 43,436
Total Engine and Tender Weight (lbs / kg)241,584 / 109,581
Tender Water Capacity (gals / ML)1980 / 7.504200 / 15.91
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)4 / 4 7.80 / 7
Minimum weight of rail (calculated) (lb/yd / kg/m)41 / 20.5059 / 29.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)61.50 / 156272 / 1829
Boiler Pressure (psi / kPa)152.30 / 1050200 / 1380
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x61019" x 26" / 483x660 (1)
Low Pressure Cylinders (dia x stroke) (in / mm)27.5" x 26" / 699x660 (1)
Tractive Effort (lbs / kg)16,368 / 7424.4115,001 / 6804.35
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.55 7.12
Heating Ability
Tubes (number - dia) (in / mm)241 - 1.875" / 48
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.50 / 3.8112.75 / 3.89
Firebox Area (sq ft / m2)139 / 12.91
Grate Area (sq ft / m2)19.80 / 1.8425 / 2.32
Evaporative Heating Surface (sq ft / m2)1153 / 107.161634 / 151.80
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1153 / 107.161634 / 151.80
Evaporative Heating Surface/Cylinder Volume163.12383.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation30165000
Same as above plus superheater percentage30165000
Same as above but substitute firebox area for grate area27,800
Power L16255
Power MT387.18

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