Data out of 1938 BAR locomotive diagram book provided in May 2005 from Allen Stanley's extension collection. See also See also George H Drury, Guide to North American Steam Locomotives, Revised Edition (Waukesha, WI: Kalmbach Books, 2015), p. 81. (Thanks to Chris Hohl for his 6 April 2025 email noting the correct wheelbases and supplying the superheater area as stated in the Locomotive Cyclopedia ) Works numbers were 67422-67426 in August 1927.
These were small Pacifics with few appurtances aside from a healthy amount of superheater area. George Drury evaluated the design, noting the driver diameters "gave them pullling power instead of great speed.' They also weighed 20 short tons (18,413 kg) less that a USRA Light Pacific.
252 was destroyed at Ingalls in March 1945. Although Locobase could find no direct reporting on the incident, he noted that the Interstate Commerce Commission had investigated and published Investigation #2877 discussing it. The others were scrapped in 1953.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | F |
| Locobase ID | 6615 |
| Railroad | Bangor & Aroostook |
| Country | USA |
| Whyte | 4-6-2 |
| Number in Class | 5 |
| Road Numbers | 250-254 |
| Gauge | Std |
| Number Built | 5 |
| Builder | Alco-Schenectady |
| Year | 1927 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.50 / 3.66 |
| Engine Wheelbase (ft / m) | 33.33 / 10.16 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.38 |
| Overall Wheelbase (engine & tender) (ft / m) | 64.52 / 19.67 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 141,000 / 63,957 |
| Engine Weight (lbs / kg) | 237,000 / 107,502 |
| Tender Loaded Weight (lbs / kg) | 161,000 / 73,028 |
| Total Engine and Tender Weight (lbs / kg) | 398,000 / 180,530 |
| Tender Water Capacity (gals / ML) | 8500 / 32.20 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 10.90 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 78 / 39 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 69 / 1753 |
| Boiler Pressure (psi / kPa) | 210 / 1430 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 28" / 533x711 |
| Tractive Effort (lbs / kg) | 31,944 / 14489.57 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.41 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 166 - 2" / 51 |
| Flues (number - dia) (in / mm) | 30 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 19 / 5.79 |
| Firebox Area (sq ft / m2) | 230 / 21.37 |
| Grate Area (sq ft / m2) | 52 / 4.83 |
| Evaporative Heating Surface (sq ft / m2) | 2671 / 248.14 |
| Superheating Surface (sq ft / m2) | 693 / 64.38 |
| Combined Heating Surface (sq ft / m2) | 3364 / 312.52 |
| Evaporative Heating Surface/Cylinder Volume | 238.06 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 10,920 |
| Same as above plus superheater percentage | 13,213 |
| Same as above but substitute firebox area for grate area | 58,443 |
| Power L1 | 21,649 |
| Power MT | 1015.49 |