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 Wheelbase (ft)12.83
Engine Wheelbase (ft)33.33
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft)64.87
Axle Loading (Maximum Weight per Axle) (lbs)54,900
Weight on Drivers (lbs)145,500
Engine Weight (lbs)240,000
Tender Loaded Weight (lbs)148,000
Total Engine and Tender Weight (lbs)388,000
Tender Water Capacity (gals)8500
Tender Fuel Capacity (oil/coal) (gals/tons)14
Minimum weight of rail (calculated) (lb/yd)81
Geometry Relating to Tractive Effort
Driver Diameter (in)73
Boiler Pressure (psi)190
High Pressure Cylinders (dia x stroke) (in)24" x 28"
Tractive Effort (lbs)35,680
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Firebox Area (sq ft)203
Grate Area (sq ft)49.10
Evaporative Heating Surface (sq ft)2784
Superheating Surface (sq ft)641
Combined Heating Surface (sq ft)3425
Evaporative Heating Surface/Cylinder Volume189.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9329
Same as above plus superheater percentage11,102
Same as above but substitute firebox area for grate area45,898
Power L115,087
Power MT685.80


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