Brazil National Rwy 2-8-4 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 142N (Locobase 1129)

Data from Thierrey Stora, whose website on French Compound Locomotives supplies this infomation, also supplied much of the data.

Sixty-six engines built at Creusot, Cail, and Fives-Lille along the same lines as the Chapelon 4-8-4 (Locobase 1172), but much smaller and less demanding on the machinery. Supplied with one of three tenders, including one that carried firewood instead of brown coal.

Still, like the 4-8-4s, they had trouble on the very tight curves (50 m minimum as opposed to the specified 80 m) and were limited to 38 mph (60 kph).

Principal Dimensions by Steve Llanso of Sweat House Media

Class142N
Locobase ID1129
RailroadBrazil National Rwy
CountryBrazil
Whyte2-8-4
Number in Class66
Road Numbers
GaugeMetre
Number Built66
BuilderGELSA
Year1951
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.50 / 4.11
Engine Wheelbase (ft / m)30.24 / 9.22
Ratio of driving wheelbase to overall engine wheelbase 0.45
Overall Wheelbase (engine & tender) (ft / m)71.10 / 21.67
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)89,071 / 40,402
Engine Weight (lbs / kg)154,324 / 70,000
Tender Loaded Weight (lbs / kg)160,386 / 72,750
Total Engine and Tender Weight (lbs / kg)314,710 / 142,750
Tender Water Capacity (gals / ML)4785 / 18.13
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)13.20 / 12
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)217.60 / 15
High Pressure Cylinders (dia x stroke) (in / mm)17" x 22" / 432x560
Tractive Effort (lbs / kg)23,520 / 10668.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.79
Heating Ability
Tubes (number - dia) (in / mm)88 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)15.27 / 4.65
Firebox Area (sq ft / m2)212 / 19.70
Grate Area (sq ft / m2)43 / 4
Evaporative Heating Surface (sq ft / m2)1315 / 122.21
Superheating Surface (sq ft / m2)484 / 44.98
Combined Heating Surface (sq ft / m2)1799 / 167.19
Evaporative Heating Surface/Cylinder Volume227.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9357
Same as above plus superheater percentage11,883
Same as above but substitute firebox area for grate area58,587
Power L121,118
Power MT2090.79

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