Bessemer & Lake Erie 4-6-2 "Pacific" Locomotives in 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 Rail Data Exchange.

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.

Principal Dimensions 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 / m)12.83 / 3.91
Engine Wheelbase (ft / m)33.33 / 10.16
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft / m)64.87 / 19.77
Axle Loading (Maximum Weight per Axle) (lbs / kg)54,900 / 24,902
Weight on Drivers (lbs / kg)145,500 / 65,998
Engine Weight (lbs / kg)240,000 / 108,862
Tender Loaded Weight (lbs / kg)148,000 / 67,132
Total Engine and Tender Weight (lbs / kg)388,000 / 175,994
Tender Water Capacity (gals / ML)8500 / 32.20
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14 / 12.70
Minimum weight of rail (calculated) (lb/yd / kg/m)81 / 40.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)73 / 1854
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)24" x 28" / 610x711
Tractive Effort (lbs / kg)35,680 / 16184.20
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Firebox Area (sq ft / m2)203 / 18.87
Grate Area (sq ft / m2)49.10 / 4.56
Evaporative Heating Surface (sq ft / m2)2784 / 258.74
Superheating Surface (sq ft / m2)641 / 59.57
Combined Heating Surface (sq ft / m2)3425 / 318.31
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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Wes Barris