Pennsylvania 2-4-6 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Old L (Locobase 5489)

Data from (Viewed 11 April 2003).

According to William Edson's exhaustive compilation, this locomotive only operated for about 11 years and was scrapped in October 1893. The arrangement looks very much like a Mason Bogie suburban tank engine. 2-4-6Ts (56-60, 1883) ran on the Long Island Railroad, but these were quite a bit smaller. The firebox on the L class was shallow, narrow and long with a sharply sloped backhead.

Specifications by Steve Llanso of Sweat House Media
ClassOld L
Locobase ID5489
RailroadPennsylvania (PRR)
Number in Class1
Road Numbers
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase7'
Engine Wheelbase31.33'
Ratio of driving wheelbase to overall engine wheebase 0.22
Overall Wheelbase (engine & tender)31.33'
Axle Loading (Maximum Weight per Axle)32500 lbs
Weight on Drivers59750 lbs
Engine Weight124100 lbs
Tender Light Weight
Total Engine and Tender Weight124100 lbs
Tender Water Capacity1680 gals
Tender Fuel Capacity (oil/coal)1.5 tons
Minimum weight of rail (calculated)50 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter62"
Boiler Pressure125 psi
Cylinders (dia x stroke)17" x 24"
Tractive Effort11886 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.03
Heating Ability
Firebox Area
Grate Area21.05 sq. ft
Evaporative Heating Surface
Superheating Surface
Combined Heating Surface0
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2631
Same as above plus superheater percentage2631
Same as above but substitute firebox area for grate area0
Power L10
Power MT0


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