Manila Railroad 2-8-2 Locomotives in Philippines


Class Details by Steve Llanso of Sweat House Media

Class 251 (Locobase 15460)

Data from DeGolyer, Vol 79, pp. 400+. Works numbers were 60515, 60540-60542 in June 1928 and 60581-60584 in August.

Using the same boiler and firebox as the slightly earlier three-cylinder Pacifics (Locobase 4428), Eddystone lengthened piston stroke and shrank the driver diameter to confer more tractive effort on these Mikados. Like the Pacifics, firebox heating surface area included 13 sq ft (1.2 sq m) of arch tubes, eight inch (203 mm) piston valves fed the cylinders, and a Worthington No 1 feed water heater was mounted on the left side.

Principal Dimensions by Steve Llanso of Middle Run Media

Class251
Locobase ID15460
RailroadManila Railroad
CountryPhilippines
Whyte2-8-2
Number in Class8
Road Numbers251-258
Gauge3'6"
Number Built8
BuilderBaldwin
Year1928
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.25 / 4.04
Engine Wheelbase (ft / m)27.58 / 8.41
Ratio of driving wheelbase to overall engine wheelbase 0.48
Overall Wheelbase (engine & tender) (ft / m)56.42 / 17.20
Axle Loading (Maximum Weight per Axle) (lbs / kg)25,760 / 11,685
Weight on Drivers (lbs / kg)102,000 / 46,266
Engine Weight (lbs / kg)143,000 / 64,864
Tender Loaded Weight (lbs / kg)117,500 / 53,297
Total Engine and Tender Weight (lbs / kg)260,500 / 118,161
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)6 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)43 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)195 / 13.40
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x559 (3)
Tractive Effort (lbs / kg)25,639 / 11629.67
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.98
Heating Ability
Tubes (number - dia) (in / mm)136 - 2" / 51
Flues (number - dia) (in / mm)24 - 5.375" / 137
Flue/Tube length (ft / m)16 / 4.88
Firebox Area (sq ft / m2)128 / 11.89
Grate Area (sq ft / m2)33.20 / 3.08
Evaporative Heating Surface (sq ft / m2)1800 / 167.22
Superheating Surface (sq ft / m2)435 / 40.41
Combined Heating Surface (sq ft / m2)2235 / 207.63
Evaporative Heating Surface/Cylinder Volume266.69
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6474
Same as above plus superheater percentage7704
Same as above but substitute firebox area for grate area29,702
Power L114,688
Power MT1269.86

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