Philadelphia & Reading / Williams Valley 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class A F Baker (Locobase 12037)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 18, p. 46 Works number was 12806 in June 1892.

The Williams Valley Railway was a 7.2-mile short line based in Lykens, Pa that hauled coal and general freight. Never very prosperous, it ran deficits throughout most of its independent existence. This mogul may have been its only locomotive. The Philadelphia & Reading took over the WV in 1908-1909 and gave the A F Baker road number 1460. It was scrapped in June 1916.

Class N4-a (Locobase 12664)

Data from S F Prince, Jr, "Rebuilding Locomotives - Philadelphia & Reading", Railroad Gazette, Volume XXXVII, No 2 (24 June 1904), pp. 46-48.

Prince explains the original 2-4-2 (see Locobase 8879) that was modified into this unusual Mogul "...was frequently shopped on account of broken frames and cylinders." The overhaul resulted in this express engine whose drivers were six inches taller than any other of the 2-6-0s in Locobase. Eight more of the original class

Unlike most Moguls, 303 did not have its pony truck equalized with the drivers, instead having its weight borne by a cast-iron bed plate. The boiler was modified by removing the combustion chamber (which increased tube length by 40.34 inches) and the water-bar grate; the latter was replaced by shaking grates.

The boiler's centerline also was raised to allow the third driving axle to pass under the firebox.

Four of the rebuilds were scrapped in December 1906, another in May 1908.

The other 4 underwent a further transformation as L-6a class 4-6-0s; driver diameter was probably reduced to 68". In only one instance did an engine survive past 1911: 682 (now 315) was rebuilt again as a 4-6-0 (class L-6b) and operated until 1927.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassA F BakerN4-a
Locobase ID12,037 12,664
RailroadWilliams Valley (P & R)Philadelphia & Reading
Number in Class49
Road Numbers1301-309
Number Built4
BuilderBurnham, Williams & CoReading
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.8114.33 / 4.37
Engine Wheelbase (ft / m)19.75 / 6.0223.67 / 7.21
Ratio of driving wheelbase to overall engine wheebase 0.63 0.61
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)76,000 / 34,473131,400 / 59,602
Engine Weight (lbs / kg)91,000 / 41,277159,300 / 72,257
Tender Loaded Weight (lbs / kg)159,300 / 72,257
Total Engine and Tender Weight (lbs / kg)318,600 / 144,514
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 2173 / 36.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 137278 / 1981
Boiler Pressure (psi / kPa)140 / 9.70200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x61020" x 26" / 508x660
Tractive Effort (lbs / kg)17,136 / 7772.7722,667 / 10281.59
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.44 5.80
Heating Ability
Firebox Area (sq ft / m2)123.50 / 11.48137 / 12.73
Grate Area (sq ft / m2)25.70 / 2.3976 / 7.06
Evaporative Heating Surface (sq ft / m2)1189 / 110.501765 / 164.03
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1189 / 110.501765 / 164.03
Evaporative Heating Surface/Cylinder Volume168.21186.70
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation359815,200
Same as above plus superheater percentage359815,200
Same as above but substitute firebox area for grate area17,29027,400
Power L132206738
Power MT280.22339.15

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Wes Barris