Philadelphia & Reading 0-8-0 "Switcher" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Black Diamond (Locobase 13426)

Data from "Economy of Anthracite Coal for Locomotives," The Scientific American, Volume 2 (1860), p. 197. See also Paul T Warner, "The Development of the Anthracite-Burning Locomotive," Railroad & Locomotive Historical Society, Volume 52, pp. 11-28.

James Milholland was the first locomotive designer on a major railroad to put dozens of anthracite-burning locomotives in service. Warner comments that Milholland raised the firebox above the driving axles to gain the grate size needed to burn the thin bed of anthracite properly. The grate had 16 water-tube grate bars.

The Scientific American report recounts the hauling capacity of these freight haulers. Pulling 110 loaded cars (910 short tons) over a 95 run that had a fall of 620 feet, the locomotive would average 8 mph and burn about 5 tons of coal.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassBlack Diamond
Locobase ID13,426
RailroadPhiladelphia & Reading
Number in Class5
Road Numbers
Number Built5
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)63,700 / 28,894
Engine Weight (lbs / kg)63,700 / 28,894
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)27 / 13.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43 / 1092
Boiler Pressure (psi / kPa)100 / 6.90
High Pressure Cylinders (dia x stroke) (in / mm)18" x 22" / 457x559
Tractive Effort (lbs / kg)14,090 / 6391.12
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.52
Heating Ability
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)32.50 / 3.02
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3250
Same as above plus superheater percentage3250
Same as above but substitute firebox area for grate area
Power L1
Power MT

All material Copyright ©
Wes Barris