Data from tables in 1930 Locomotive Cyclopedia, "Standard 2-6-6-2 Type Locomotive," Railway Mechanical Engineer, Volume 93, No 2 (February 1919), pp. 75-77 and from American Locomotive Company, Standardized Locomotives, US Railroad Administration (Alco Pamphlet 10049, 1918), pp. 32-33, reprinted by (Ocean, NJ: Specialty Press , 1973), and DeGolyer, Volume 58, pp. 173+. (Thanks to Chris Hohl for his 9 January 2022 email correcting the number delivered by the two builders and an errant engine wheelbase.) Alco-Schenectady and Baldwin each delivered fifteen locomotives to this design.)
See also "Standard Equipment Specialties," Railway Mechanical Engineer, Vol 93, No 3 (March 1919), pp. 137-138 for a list of all the "special equipment" by manufacturers--everything from air brakes to lubricators to rolled steel wheels--and the USRA designs on which they appeared.
This design was one of two articulated types that formed part of the roster of standardized designs developed for general production in WW I. Its firebox was of similar design to that of the USRA's Light 2-10-2 (Locobase 89) except for a somewhat longer combustion chamber. That section, which presented 155 sq ft (14.4 sq m), and 34 sq ft (3.15 sq m) of arch tubes contributed to firebox heating surface. Twelve-inch (305 mm) piston valves served the HP cylinders while slide valves supplied the LP cylinders. The boiler's tube and flue count was identical to the Light 2-10-2, except that each unit measured 42" (1,067 mm) longer.
These light USRA Mallets weren't very well received. See Locobase 299 for the C&O's opinion of the design and Locobase 7896 for the Wheeling engines.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | Light mallet |
Locobase ID | 14240 |
Railroad | United States Railroad Administration (USRA) |
Country | USA |
Whyte | 2-6-6-2 |
Number in Class | |
Road Numbers | 10,000 |
Gauge | Std |
Number Built | |
Builder | several |
Year | 1918 |
Valve Gear | Baker |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 21 / 6.40 |
Engine Wheelbase (ft / m) | 49.75 / 15.16 |
Ratio of driving wheelbase to overall engine wheelbase | 0.42 |
Overall Wheelbase (engine & tender) (ft / m) | 89.42 / 27.26 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 60,100 / 27,261 |
Weight on Drivers (lbs / kg) | 358,000 / 162,386 |
Engine Weight (lbs / kg) | 448,000 / 203,210 |
Tender Loaded Weight (lbs / kg) | 206,500 / 93,667 |
Total Engine and Tender Weight (lbs / kg) | 654,500 / 296,877 |
Tender Water Capacity (gals / ML) | 12,000 / 45.45 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 16 / 15 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 99 / 49.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 57 / 1448 |
Boiler Pressure (psi / kPa) | 225 / 1550 |
High Pressure Cylinders (dia x stroke) (in / mm) | 23" x 32" / 584x813 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 35" x 32" / 889x813 |
Tractive Effort (lbs / kg) | 79,336 / 35986.25 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.51 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 247 - 2.25" / 57 |
Flues (number - dia) (in / mm) | 45 - 5.5" / 140 |
Flue/Tube length (ft / m) | 24 / 7.32 |
Firebox Area (sq ft / m2) | 416 / 38.65 |
Grate Area (sq ft / m2) | 76.30 / 7.09 |
Evaporative Heating Surface (sq ft / m2) | 5443 / 505.67 |
Superheating Surface (sq ft / m2) | 1292 / 120.03 |
Combined Heating Surface (sq ft / m2) | 6735 / 625.70 |
Evaporative Heating Surface/Cylinder Volume | 353.76 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 17,168 |
Same as above plus superheater percentage | 20,429 |
Same as above but substitute firebox area for grate area | 111,384 |
Power L1 | 11,488 |
Power MT | 424.47 |