See also "Standard Equipment Specialties," Railway Mechanical Engineer, Vol 93, No 3 (March 1919), pp. 137-138 for a list of all the "special equipment" by manufacturers--everything from air brakes to lubricators to rolled steel wheels--and the USRA designs on which they appeared.
Intended to be the standardized Pacific heavy passenger express locomotive, but only twenty were actually allocated by the USRA. The design shared the tube and flue count with two other USRA variants: Light Mikado (Locobase 40) and Light Mountain (Locobase 231). Firebox heating surface included 72 sq ft (6.7 sq m) in the combustion chamber and 28 sq ft (2.6 sq m) in arch tubes. Cylinders were served by piston valves measuring 14" (356 mm) in diameter.
Erie's were built by Alco-Richmond (10) and Baldwin (10) at the direction of the government-run USRA beginning in 1918.
This was the "light" Pacific design standardized by the government-run USRA created in World War I and built by Baldwin and Alco. Three railroads actually took delivery of 81 locomotives: Atlantic Coast Lines (28 by Alco-Brooks, 17 by Alco-Richmond), the B&O (20 by Baldwin, 10 by Alco-Richmond), and L&N (6 by Alco-Richmond).
Although described as light, the design in fact had a relatively large grate compared to other engines within its axle-loading range. Firebox heating surface included 46 sq ft (4.27 sq m) in the combustion chamber and 27 sq ft (2.51 sq m) in arch tubes. Cylinders were served by piston valves measuring 14" (356 mm) in diameter.
In the literature describing particular railroads' acquisitions, this design often appears either as the direct-from-USRA variant or a later class based on the USRA Light. And very often, the USRA-inspired 4-6-2 is described as the best, most reliable Pacifics the railroad would own.
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||United States Railroad Administration (USRA)||United States Railroad Administration (USRA)|
|Number in Class|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||14 / 4.27||13 / 3.96|
|Engine Wheelbase (ft / m)||36.17 / 11.02||34.75 / 10.59|
|Ratio of driving wheelbase to overall engine wheebase||0.39||0.37|
|Overall Wheelbase (engine & tender) (ft / m)||70.70 / 21.55||68.62 / 20.92|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)||60,000 / 27,216||54,000 / 24,494|
|Weight on Drivers (lbs / kg)||197,000 / 89,358||162,000 / 73,482|
|Engine Weight (lbs / kg)||306,000 / 138,799||277,000 / 125,645|
|Tender Loaded Weight (lbs / kg)||194,200||194,000|
|Total Engine and Tender Weight (lbs / kg)||500,200||471,000|
|Tender Water Capacity (gals / ML)||10,000 / 37.88||10,000 / 37.88|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||16 / 14.50||16 / 14.50|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||109 / 54.50||90 / 45|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||79 / 2007||73 / 1854|
|Boiler Pressure (psi / kPa)||200 / 13.80||200 / 13.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||27" x 28" / 686x711||25" x 28" / 635x711|
|Tractive Effort (lbs / kg)||43,925 / 19924.07||40,753 / 18485.27|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.48||3.98|
|Firebox Area (sq ft / m2)||327 / 30.39||261 / 24.26|
|Grate Area (sq ft / m2)||70.80 / 6.58||66.70 / 6.20|
|Evaporative Heating Surface (sq ft / m2)||3824 / 355.39||3333 / 309.76|
|Superheating Surface (sq ft / m2)||887 / 82.43||794 / 73.79|
|Combined Heating Surface (sq ft / m2)||4711 / 437.82||4127 / 383.55|
|Evaporative Heating Surface/Cylinder Volume||206.09||209.52|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||14,160||13,340|
|Same as above plus superheater percentage||16,850||15,875|
|Same as above but substitute firebox area for grate area||77,826||62,118|