Bangor & Aroostook 4-6-2 "Pacific" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class F (Locobase 6615)

Data out of 1938 BAR locomotive diagram book provided in May 2005 from Allen Stanley's extension collection. Works numbers were 67422-67426 in August 1927.

These were small Pacifics with few appurtances aside from a healthy amount of superheater area. 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.

NB:The BAR diagram notes the type of superheater and the number of flues, but not the area. Locobase estimates the area as 660 sq ft based on other superheater installations on similar locomotives.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID6615
RailroadBangor & Aroostook
Number in Class5
Road Numbers250-254
Number Built5
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)21.75 / 6.63
Ratio of driving wheelbase to overall engine wheebase 0.55
Overall Wheelbase (engine & tender) (ft / m)69.62 / 21.22
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 / ML/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 / 14.50
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
Firebox Area (sq ft / m2)230 / 21.38
Grate Area (sq ft / m2)52 / 4.83
Evaporative Heating Surface (sq ft / m2)2671 / 248.23
Superheating Surface (sq ft / m2)660 / 61.34
Combined Heating Surface (sq ft / m2)3331 / 309.57
Evaporative Heating Surface/Cylinder Volume237.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,920
Same as above plus superheater percentage13,104
Same as above but substitute firebox area for grate area57,960
Power L121,001
Power MT985.09

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Wes Barris