Data from [], 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 | |
---|---|
Class | 141 |
Locobase ID | 4428 |
Railroad | Manila Railroad |
Country | Philippines |
Whyte | 4-6-2 |
Number in Class | 10 |
Road Numbers | 141-150 |
Gauge | 3'6" |
Number Built | 10 |
Builder | Baldwin |
Year | 1926 |
Valve Gear | Walschaert |
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 Volume | 293.35 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 6474 |
Same as above plus superheater percentage | 7704 |
Same as above but substitute firebox area for grate area | 29,702 |
Power L1 | 18,177 |
Power MT | 1571.51 |