Manila Railroad 4-6-2 Locomotives in Philippines


Class Details by Steve Llanso of Sweat House Media

Class 141 (Locobase 4428)

Data from [link], last accessed 21 July 2007. DeGolyer, Vol 79, pp. 380+. Works numbers were 59698-59700 in November 1926, 60103-60105 in July 1927, and 60946-60949 in August 1929.

The photo shows a burly, high-boilered Pacific with a coned second course, small, derby-shaped domes and short stack. Firebox heating surface area included 13 sq ft (1.2 sq m) of arch tubes. Eight inch (203 mm) piston valves fed the cylinders. A Worthington No 1 feed water heater was mounted on the left side.

It wasn't often that Pittsburgh locomotive builder H K Porter's components would be preferred over those of Baldwin, but a note in these specs advise that the pilot was to be based on Porter's "print 41588".

The most notable feature of this design, of course, is the use of three cylinders in this class. Baldwin was not a strong advocate of 3-legged power, so to employ it in a narrow-gauge context suggests either a very insistent customer or a need to achieve a certain combination of speed and power, whatever the cost in maintenance. The railroad would order three-cylinder Mikados the very next year and build up quite a stud of center-cylinder engines.

Principal Dimensions by Steve Llanso of Middle Run Media
Class141
Locobase ID4428
RailroadManila Railroad
CountryPhilippines
Whyte4-6-2
Number in Class10
Road Numbers141-150
Gauge3'6"
Number Built10
BuilderBaldwin
Year1926
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)27 / 8.23
Ratio of driving wheelbase to overall engine wheelbase 0.35
Overall Wheelbase (engine & tender) (ft / m)50.21 / 15.30
Axle Loading (Maximum Weight per Axle) (lbs / kg)25,760 / 11,685
Weight on Drivers (lbs / kg)76,500 / 34,700
Engine Weight (lbs / kg)133,450 / 60,532
Tender Loaded Weight (lbs / kg)76,000 / 34,473
Total Engine and Tender Weight (lbs / kg)209,450 / 95,005
Tender Water Capacity (gals / ML)3500 / 13.26
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)54 / 1372
Boiler Pressure (psi / kPa)195 / 1340
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508 (3)
Tractive Effort (lbs / kg)20,719 / 9397.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.69
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 Volume293.35
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 L118,177
Power MT1571.51

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