Paulista 2-6-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 13988)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 44, p. 1. See also "CPEF - Cia. Paulista de Estradas de Ferro--Locomotivas a vapor 2-6-2 nñ 910 e 911" on the VFCO website at [], last accessed 20 February 2021. Works numbers were 40674-40675 in September 1912.

It's worth repeating the Baldwin specs guiding production of the wood-burning radial tanks that came from Eddystone six months earlier (Locobase 13652): The rail weighed 18-kg/metre (36 lb/yard) with ties laid every 18" (0.5 metres), a 3% grade measuring 1,420 metres (4,659 ft), another of 2.5% and 1,600 metres (5,249 ft) long, and a minimum curve radius of 85 meters (279 ft) or 13.5 degrees.

Adding a leading truck to the wheel arrangement helped to distribute the 4-ton (3,629-kg) weight increase that accompanied the use of slightly longer (4" or 102 mm) boiler tubes and a generally heavier frame. Able to burn either wood or coal fuel in bunkers that held 4 cu m of the former and 1.647 cu m of the latter.

The diagram and photographs shown on the Centro Oeste website bring out some key characteristics of this pair. One was the enormous stack, a squat set of cones that held the netting that trapped wood sparks. Another appeared in the the 12" (305 mm) greater distance between driving axles 1 and 2 compared to the 36" ( 914 mm) distance between 2 and 3. A third was the Walschaert's unusual arrangement of links required by the gear's size and the small area between the cylinder and the first driven axle.

Unlike the 0-6-2Ts, which morphed into 2-6-2Ts then 2-6-0Ts, the 10-11 only saw a number change and no shape shifting until late in their Portland Cement careers when the 10, now 14, discarded its trailing axle.

They later operated on the Industrial E de F de Perus-Pirapora as the latter's 14 and 10, respectively.


Class 6 (Locobase 13656)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 44, p. 9. (Thanks to Teemu Koivumaki for his 20 February 2021 email noting the second of two 1916 road numbers and the 1940 change in numbers.) Works numbers were 38841-38842 in November 1912.


Class 70/81 (Locobase 13655)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 44, p. 6. (Thanks to Koivumaki for his 20 February 2021 email noting the latterday road number change to 810-812.) Works numbers were 37557-37559 in March 1912.

The specs for this trio of Prairie tanks included what can only be described as a limited warranty. "[A]ll repairs to boiler, frames, side rods, etc. which may have to be made during service over the first 20,000 kilometers [sic], or any others over the first 15,000 kilometers will be performed for account of builders."

Principal Dimensions by Steve Llanso of Sweat House Media

Class10670/81
Locobase ID13988 13656 13655
RailroadPaulistaPaulistaPaulista
CountryBrazilBrazilBrazil
Whyte2-6-2T2-6-2T2-6-2T
Number in Class223
Road Numbers10-11/910-9116, 16 /78-79/240-24170-72/81-83/810-812
Gauge60 cmMetreMetre
Number Built223
BuilderBaldwinBaldwinBaldwin
Year191219121912
Valve GearWalschaertWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.99 / 2.139 / 2.7410 / 3.05
Engine Wheelbase (ft / m)20.24 / 6.1724.50 / 7.4724.50 / 7.47
Ratio of driving wheelbase to overall engine wheelbase 0.35 0.37 0.41
Overall Wheelbase (engine & tender) (ft / m)20.24 / 6.1724.50 / 7.4724.50 / 7.47
Axle Loading (Maximum Weight per Axle) (lbs / kg)14,162 / 6424
Weight on Drivers (lbs / kg)42,399 / 19,23287,000 / 39,46382,000 / 37,195
Engine Weight (lbs / kg)55,001 / 24,948120,000 / 54,431110,000 / 49,895
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)55,001 / 24,948120,000 / 54,431110,000 / 49,895
Tender Water Capacity (gals / ML)351 / 1.331800 / 6.821800 / 6.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)24 / 1248 / 2446 / 23
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 83846 / 116844 / 1118
Boiler Pressure (psi / kPa)165.30 / 11.40200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)12.01" x 15.98" / 305x40616" x 22" / 406x55916" x 20" / 406x508
Tractive Effort (lbs / kg)9814 / 4451.5620,814 / 9441.0819,782 / 8972.97
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.32 4.18 4.15
Heating Ability
Tubes (number - dia) (in / mm)87 - 1.732" / 44176 - 2" / 51139 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.50 / 3.2010.25 / 3.1210.50 / 3.20
Firebox Area (sq ft / m2)42.95 / 3.9994 / 8.7383 / 7.71
Grate Area (sq ft / m2) 9.36 / 0.8717.80 / 1.6514.50 / 1.35
Evaporative Heating Surface (sq ft / m2)457 / 42.451031 / 95.78841 / 78.13
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)457 / 42.451031 / 95.78841 / 78.13
Evaporative Heating Surface/Cylinder Volume218.11201.38180.70
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation154735602900
Same as above plus superheater percentage154735602900
Same as above but substitute firebox area for grate area710018,80016,600
Power L1291544963958
Power MT454.71341.79319.24

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