Ferrocarril Tumbes-Puerto Pizarro 2-6-0 Locomotives in Peru

Class Details by Steve Llanso of Sweat House Media

Class Tumbes (Locobase 13477)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 32, p. 261. Information on the railway from Elio Galessio,"Breve Rese'a Histórica de los Ferrocarriles en el Per+" from [], last accessed 20 November 2011. Works numbers were 32887-32888 in July 1908.

Several Cuban railroads operated identical Moguls on their 2 1/2-gauge railways, but this pair served a short railroad in the North of Peru. Also known as the Tumbes a La Palizada (and so identified in Baldwin's specifications), this 11-km (6.8-mile) short line was buillt in 1908 under authority granted in 1907 by Law 697.

The P & LP opened in 1909, most likely using the Tumbes and her sister the Puerto. The profile wasn't especially challenging - maximum grade inclined a mere 1%. The specs said the Mogul should manage 150 trailing tons up this grade and should traverse "easily" curves as tight as 200 feet (61 metres) in radius.

According to Galessio,the line always struggled: "It always had the problem, among many others, of working at a loss given the low numbers of passenger and freight that it transported." (Locobase translation). The line closed in 1949.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13477
RailroadFerrocarril Tumbes-Puerto Pizarro
Number in Class2
Road Numbers1, 8
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.33 / 2.54
Engine Wheelbase (ft / m)14.33 / 4.37
Ratio of driving wheelbase to overall engine wheelbase 0.58
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)29,000 / 13,154
Engine Weight (lbs / kg)35,000 / 15,876
Tender Loaded Weight (lbs / kg)24,000 / 10,886
Total Engine and Tender Weight (lbs / kg)59,000 / 26,762
Tender Water Capacity (gals / ML)1200 / 4.55
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)16 / 8
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)36 / 914
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)11" x 16" / 279x406
Tractive Effort (lbs / kg)6857 / 3110.29
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.23
Heating Ability
Tubes (number - dia) (in / mm)94 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 7.73 / 2.36
Firebox Area (sq ft / m2)41.40 / 3.85
Grate Area (sq ft / m2) 7.10 / 0.66
Evaporative Heating Surface (sq ft / m2)323 / 30.01
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)323 / 30.01
Evaporative Heating Surface/Cylinder Volume183.54
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1065
Same as above plus superheater percentage1065
Same as above but substitute firebox area for grate area6210
Power L12710
Power MT618.05

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