Bessemer & Lake Erie 4-6-2 "Pacific" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class P1A (Locobase 9034)

Data from B&LE 1-1944 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Firebox heating surface area included 21 sq ft in arch tubes.

Alco produced these locomotives in pairs, the first with slightly more exhaust clearance than the second (3/16" vs 1/8") but less valve lap (7/8" vs 1 1/16"). All four had generous 14" piston valves.

Like the earlier Eight-wheelers, the P1As constituted a very small part of the B & LE's motive power roster. They were medium-sized, medium-powered Pacifics that could easily handle the locals that ran up and down the mainline until the end of steam in 1953.

Specifications by Steve Llanso of Sweat House Media
Locobase ID9034
RailroadBessemer & Lake Erie
Number in Class4
Road Numbers901-904
Number Built4
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase12.83'
Engine Wheelbase33.33'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)64.87'
Axle Loading (Maximum Weight per Axle)54900 lbs
Weight on Drivers145500 lbs
Engine Weight240000 lbs
Tender Light Weight148000 lbs
Total Engine and Tender Weight388000 lbs
Tender Water Capacity8500 gals
Tender Fuel Capacity (oil/coal)14 tons
Minimum weight of rail (calculated)81 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter73"
Boiler Pressure190 psi
Cylinders (dia x stroke)24" x 28"
Tractive Effort35680 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Firebox Area203 sq. ft
Grate Area49.10 sq. ft
Evaporative Heating Surface2784 sq. ft
Superheating Surface641 sq. ft
Combined Heating Surface3425 sq. ft
Evaporative Heating Surface/Cylinder Volume189.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9329
Same as above plus superheater percentage11102
Same as above but substitute firebox area for grate area45898
Power L115087
Power MT685.80


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