Paracatu 2-8-2 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 15394)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 78, pp. 236+. See also the Centro-Oeste website's entry on the Paracatu at [], last accessed 31 August 2013. Works numbers were 58531-58532 in July 1925.

This railway was built well inland in Minas Gerais State and had the named city as its ultimate destination. Its first section, begun in Taipa in 1914, was opened on 31 October 1921 at Bom Despacho, 59 km (36.6 miles) away. Additional mileage accumulated gradually. The next 70 km (43.5 miles) to Dores do Indaiá opened on 28 December 1922, but two and half years were needed to completed the next 24 km (14.9) to Viana (inaugurated 29 July 1925).

The EF de Paracatu bought these small wood-burning Mikados to run on the 45 lb/yard (22.5 kg/metre) rail, scale moderate 2 1/2% grades, and get around curve radii of 80 metres (263 feet). Superheated steam drove the cylinders through 8" (203 mm) piston valves. The specs noted that special attention was to be paid to the frames "for rough track and new road bed." An additional provision required that the valve motion be "conveniently lighted". (Locobase isn't sure why ...) A nod to the fireman's comfort came with the creation of a canopy of steel plate on the front half of the tender.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15394
RailroadParacatu (EF de)
Number in Class4
Road Numbers4-5
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.50 / 3.51
Engine Wheelbase (ft / m)25.67 / 7.82
Ratio of driving wheelbase to overall engine wheelbase 0.45
Overall Wheelbase (engine & tender) (ft / m)48.54 / 14.79
Axle Loading (Maximum Weight per Axle) (lbs / kg)22,400
Weight on Drivers (lbs / kg)88,000 / 39,916
Engine Weight (lbs / kg)123,000 / 55,792
Tender Loaded Weight (lbs / kg)56,300 / 25,537
Total Engine and Tender Weight (lbs / kg)179,300 / 81,329
Tender Water Capacity (gals / ML)2650 / 10.04
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 20" / 457x508
Tractive Effort (lbs / kg)23,606 / 10707.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.73
Heating Ability
Tubes (number - dia) (in / mm)125 - 1.75" / 44
Flues (number - dia) (in / mm)21 - 5.375" / 137
Flue/Tube length (ft / m)15.50 / 4.72
Firebox Area (sq ft / m2)101 / 9.38
Grate Area (sq ft / m2)27.20 / 2.53
Evaporative Heating Surface (sq ft / m2)1566 / 145.48
Superheating Surface (sq ft / m2)402 / 37.35
Combined Heating Surface (sq ft / m2)1968 / 182.83
Evaporative Heating Surface/Cylinder Volume265.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4896
Same as above plus superheater percentage5875
Same as above but substitute firebox area for grate area21,816
Power L112,169
Power MT1219.46

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