Bangor & Aroostook 4-6-2 "Pacific" Locomotives of 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.

Curiously, the 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.

Specifications 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)12
Engine Wheelbase (ft)21.75
Ratio of driving wheelbase to overall engine wheebase 0.55
Overall Wheelbase (engine & tender) (ft)69.62
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)141,000
Engine Weight (lbs)237,000
Tender Loaded Weight (lbs)161,000
Total Engine and Tender Weight (lbs)398,000
Tender Water Capacity (gals)8500
Tender Fuel Capacity (oil/coal) (gals/tons)12
Minimum weight of rail (calculated) (lb/yd)78
Geometry Relating to Tractive Effort
Driver Diameter (in)69
Boiler Pressure (psi)210
High Pressure Cylinders (dia x stroke) (in)21" x 28"
Tractive Effort (lbs)31,944
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area (sq ft)230
Grate Area (sq ft)52
Evaporative Heating Surface (sq ft)2671
Superheating Surface (sq ft)660
Combined Heating Surface (sq ft)3331
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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