Data from Railway Age Gazette, Volume 59, No 22 (26 November 1915), p. 1012; "Interesting Variety of Types of Locomotives for the Greek, Serbian, Belgian and Russian Governments built by the American Locomotive Company", Railway & Locomotive Engineering, Volume XXVIII [28], No. 12 (December 1915), pp. 406-409. and Railway Review, Volume 57 (4 December 1915), p. 716. Works numbers were 55400-55414 in November 1915.
Reval (or Revel), later capital of Estonia, was first fortified before 1219. When Swedish King Erik XIV captured Reval in 1561, the new owners enlarged the fortress over the next 50 years. Peter the Great took Reval in 1710, he and his successors underlined the city's strategic importance by continuing to expand and upgrade the fortress into the 19th century.
One can gauge the size of the complex by 1915 by noting that Alco's order was for 15 narrow-gauge Moguls.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | A1 |
| Locobase ID | 10011 |
| Railroad | Peter the Great Fortress at Revel |
| Country | Russia |
| Whyte | 2-6-0 |
| Number in Class | 15 |
| Road Numbers | A 1-A 15 |
| Gauge | 75 cm |
| Number Built | 15 |
| Builder | Alco-Cooke |
| Year | 1915 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.20 / 2 |
| Engine Wheelbase (ft / m) | 8.20 / 3.80 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 33,041 / 14,987 |
| Engine Weight (lbs / kg) | 36,960 / 16,765 |
| Tender Loaded Weight (lbs / kg) | 17,361 / 7875 |
| Total Engine and Tender Weight (lbs / kg) | 54,321 / 24,640 |
| Tender Water Capacity (gals / ML) | 840 / 3.18 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.50 / 1 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 18 / 9 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 33.50 / 851 |
| Boiler Pressure (psi / kPa) | 165.30 / 1140 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 10.98" x 15.98" / 279x406 |
| Tractive Effort (lbs / kg) | 8080 / 3665.03 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.09 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 85 - 2" / 0 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.50 |
| Firebox Area (sq ft / m2) | 41 |
| Grate Area (sq ft / m2) | 9.26 / 0.86 |
| Evaporative Heating Surface (sq ft / m2) | 504 / 46.84 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 504 / 46.84 |
| Evaporative Heating Surface/Cylinder Volume | 287.79 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1531 |
| Same as above plus superheater percentage | 1531 |
| Same as above but substitute firebox area for grate area | 6777 |
| Power L1 | 3736 |
| Power MT | 747.84 |