Parana-Santa Catarina 4-8-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 705 (Locobase 21115)

Data from 482 S 161 Order S-1976 (June 1945) builder's card supplied in February 2023 by Teemu Koivumaki. Works numbers 73717-73718 in 1945..

Like most metre-gauge engines in Brazil, these metre Mountains burned wood. In turn, that demanded large grates to provide enough heat for the relatively large boiler. A well-endowed superheater supported the class's power demand. (Baldwin supplied 4-8-2s of somewhat larger dimensions a year later--see Locobase 972.

The ROde de Viatpo Paraná-Santa Catharina (RVPSC).was formed in 1942 from the combination of predecessors Spo Paulo-Rio Grande Railway, Paraná Railway and Paraná Northern Railway.


Class 720 (Locobase 972)

Data from a table in 1947 Locomotive Cyclopedia; and Baldwin Locomotive Works Negative 13,018 Class 4-8-2, 19 S 67 supplied in March 2023 in an email from Teemu Koivumaki. Works numbers 71583-71586 in 1945 and 73066-73067 in 1946.

As with the FNP 4-8-2 (Locobase 971), note the very low boiler and grate demand factors, reflecting an engine with relatively small cylinder volume in these wood-burner Mountains. The cylinders were fed steam through 10" (254 mm) piston valves.

Locobase 21115 shows the smaller Alco meter-gauge Mountains produced a year earlier.

Principal Dimensions by Steve Llanso of Middle Run Media

Class705720
Locobase ID21115 972
RailroadParana-Santa CatarinaParana-Santa Catarina
CountryBrazilBrazil
Whyte4-8-24-8-2
Number in Class26
Road Numbers705-706720-725
GaugeMetreMetre
Number Built26
BuilderAlco-SchenectadyBaldwin
Year19451946
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.8112.50 / 3.81
Engine Wheelbase (ft / m)31.83 / 9.7031.08 / 9.48
Ratio of driving wheelbase to overall engine wheelbase 0.39 0.40
Overall Wheelbase (engine & tender) (ft / m)59.98 / 18.2858.67
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)105,500 / 47,854120,000 / 54,431
Engine Weight (lbs / kg)161,000 / 73,028170,000 / 77,111
Tender Loaded Weight (lbs / kg)85,700 / 38,87380,000 / 36,287
Total Engine and Tender Weight (lbs / kg)246,700 / 111,901250,000 / 113,398
Tender Water Capacity (gals / ML)37003700 / 14.02
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)44 / 2250 / 25
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 116846 / 1168
Boiler Pressure (psi / kPa)185 / 12.80224.80 / 15.50
High Pressure Cylinders (dia x stroke) (in / mm)20" x 22" / 508x55919" x 22" / 483x559
Tractive Effort (lbs / kg)30,083 / 13645.4432,990 / 14964.03
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.51 3.64
Heating Ability
Tubes (number - dia) (in / mm)129 - 2" / 51171 - 2" / 51
Flues (number - dia) (in / mm)22 - 5.375" / 13734 - 5.5" / 140
Flue/Tube length (ft / m)19.08 / 5.8218 / 5.49
Firebox Area (sq ft / m2)124 / 11.52159 / 14.77
Grate Area (sq ft / m2)40.20 / 3.7352 / 4.83
Evaporative Heating Surface (sq ft / m2)1994 / 185.252617 / 243.13
Superheating Surface (sq ft / m2)500 / 46.45727 / 67.54
Combined Heating Surface (sq ft / m2)2494 / 231.703344 / 310.67
Evaporative Heating Surface/Cylinder Volume249.27362.49
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation743711,690
Same as above plus superheater percentage892414,261
Same as above but substitute firebox area for grate area27,52843,607
Power L112,61323,765
Power MT1054.291746.43

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