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 Wheelbase12'
Engine Wheelbase21.75'
Ratio of driving wheelbase to overall engine wheebase 0.55
Overall Wheelbase (engine & tender)69.62'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers141000 lbs
Engine Weight237000 lbs
Tender Light Weight161000 lbs
Total Engine and Tender Weight398000 lbs
Tender Water Capacity8500 gals
Tender Fuel Capacity (oil/coal)12 tons
Minimum weight of rail (calculated)78 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure210 psi
Cylinders (dia x stroke)21" x 28"
Tractive Effort31944 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area230 sq. ft
Grate Area52 sq. ft
Evaporative Heating Surface2671 sq. ft
Superheating Surface660 sq. ft
Combined Heating Surface3331 sq. ft
Evaporative Heating Surface/Cylinder Volume237.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10920
Same as above plus superheater percentage13104
Same as above but substitute firebox area for grate area57960
Power L121001
Power MT985.09


If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.