Petrolina a Therezina 4-6-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 15180)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 66, pp. 359+. Works number was 55130 in November 1921.

One of the first engines on the P a T, this wood-burner was faced with having to consume "wood of inferior quality". Sparks were contained by the Rushton Improved cabbage stack.

The P a T's construction was moved along when the federal government approved funds to support building 164 km (101 miles) of line. Petrolina was located in Pernambuco State west of Recife and Therezina was more than 600 km to the northwest in Piaui State.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15180
RailroadPetrolina a Therezina
Number in Class1
Road Numbers4
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)17.67 / 5.39
Ratio of driving wheelbase to overall engine wheelbase 0.54
Overall Wheelbase (engine & tender) (ft / m)39.54 / 12.05
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)45,000 / 20,412
Engine Weight (lbs / kg)60,000 / 27,216
Tender Loaded Weight (lbs / kg)50,500 / 22,906
Total Engine and Tender Weight (lbs / kg)110,500 / 50,122
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)5 / 5
Minimum weight of rail (calculated) (lb/yd / kg/m)25 / 12.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)13" x 18" / 330x457
Tractive Effort (lbs / kg)10,343 / 4691.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.35
Heating Ability
Tubes (number - dia) (in / mm)125 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.83 / 3
Firebox Area (sq ft / m2)63 / 5.85
Grate Area (sq ft / m2)11.16 / 1.04
Evaporative Heating Surface (sq ft / m2)619 / 57.51
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)619 / 57.51
Evaporative Heating Surface/Cylinder Volume223.85
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1786
Same as above plus superheater percentage1786
Same as above but substitute firebox area for grate area10,080
Power L13603
Power MT529.55

All material Copyright ©
Wes Barris