Central Railroad of Pennsylvania 4-8-0 "Mastodon" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 11137)

Data from Schenectady Locomotive Works, Illustrated Catalogue of Simple and Compound Locomotives (Philadelphia: J B Lippincott, 1897), pp. 113-117. Works numbers were 4184

4185 in November 1893.

Tom Taber reported the CRP emerged from the merger of Central Pennsylvania Railroad and its eastern extension in 1892-1893. When this pair of Twelve-wheelers arrived on the CRP shortly thereafter, they followed the general lines of the Mastodon type in its early stages. In fact, Schenectady's production line continued with several more class H-1s for New York Central subsidiary Beech Creek, Clearfield & Western(Locobase 5289).

The 4 and 5 hauled iron ore along the 27.3 miles from the Bellefonte reserves to the New York Central Railroad. Not long after they entered service, however, the Mesabi iron range in Minnesota easily eclipsed the Pennsylvania mines and the railroad quickly faded.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID11137
RailroadCentral Railroad of Pennsylvania
Number in Class2
Road Numbers4-5
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.92 / 4.55
Engine Wheelbase (ft / m)24.92 / 7.60
Ratio of driving wheelbase to overall engine wheelbase 0.60
Overall Wheelbase (engine & tender) (ft / m)48.92 / 14.91
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)111,700 / 50,666
Engine Weight (lbs / kg)135,700 / 61,553
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)3550 / 13.45
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)47 / 23.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x660
Tractive Effort (lbs / kg)24,814 / 11255.45
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.50
Heating Ability
Tubes (number - dia) (in / mm)247 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)14 / 4.27
Firebox Area (sq ft / m2)147.50 / 13.71
Grate Area (sq ft / m2)31.30 / 2.91
Evaporative Heating Surface (sq ft / m2)1947 / 180.95
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1947 / 180.95
Evaporative Heating Surface/Cylinder Volume206.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5008
Same as above plus superheater percentage5008
Same as above but substitute firebox area for grate area23,600
Power L14318
Power MT340.90

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