Data from table in May 1916 issue of Railway Mechanical Engineer (RME). See also Bob Ciminel, "Paid by the Pound", Montour Trail-Letter, Volume 20, No 1 (January-February 2009), p.6. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error .)
The Montour was a coal-and-steel shortline in western Pennsylvania, a hilly profile with tunnels and curves where this low-drivered Mike fit right in. Bob Ciminel says the Brooks order resulted from the opening of the Mifflin Extension, whose steeper grades demanded more power in the motive power. Ciminel explains his title by walking the reader throught the pay scales of the time, which were built through an agreement with the BLE upon the amount of adhesive weight under the engineer's throttle hand.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 20 |
| Locobase ID | 28 |
| Railroad | Montour |
| Country | USA |
| Whyte | 2-8-2 |
| Number in Class | 16 |
| Road Numbers | 20-35 |
| Gauge | Std |
| Number Built | 16 |
| Builder | Alco-Brooks |
| Year | 1915 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 16.50 / 5.03 |
| Engine Wheelbase (ft / m) | 35.33 / 10.77 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.47 |
| Overall Wheelbase (engine & tender) (ft / m) | 63.50 / 19.35 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 249,500 / 113,171 |
| Engine Weight (lbs / kg) | 296,500 / 134,490 |
| Tender Loaded Weight (lbs / kg) | 164,200 / 74,480 |
| Total Engine and Tender Weight (lbs / kg) | 460,700 / 208,970 |
| Tender Water Capacity (gals / ML) | 9000 / 34.09 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 11 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 104 / 52 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 185 / 1280 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 27" x 32" / 686x813 |
| Tractive Effort (lbs / kg) | 64,357 / 29191.88 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.88 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 312 - 2" / 51 |
| Flues (number - dia) (in / mm) | 45 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 16 / 4.88 |
| Firebox Area (sq ft / m2) | 286 / 26.57 |
| Grate Area (sq ft / m2) | 66.70 / 6.20 |
| Evaporative Heating Surface (sq ft / m2) | 3892 / 361.71 |
| Superheating Surface (sq ft / m2) | 836 / 77.70 |
| Combined Heating Surface (sq ft / m2) | 4728 / 439.41 |
| Evaporative Heating Surface/Cylinder Volume | 183.50 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 12,340 |
| Same as above plus superheater percentage | 14,561 |
| Same as above but substitute firebox area for grate area | 62,434 |
| Power L1 | 10,644 |
| Power MT | 376.21 |