Atlanta & West Point class P-74
The closely linked Atlanta & West Point and the Western Railway of Alabama had to pull the Southern Railway's "Crescent" between Atlanta, Georgia and Montgomery, Alabama. So they each ordered one locomotive, which was given the numbers 290 (AWP) and 190 (WRA). Like the Southern Ps-4, they were based on the USRA Heavy Pacific, but like them also had smaller drivers. The diameter was initially 73 inches and was later increased to 74 inches with thicker tires, which explains the designation P-74.
Both machines were operated together. While one hauled the northbound Crescent, the other simultaneously took over the southbound one. They were retired in 1954, after which the 190 was scrapped. The 290 was saved by the “290 club”, but remained non-operational for the time being. It was finally refurbished between 1986 and 1989 and was used until 1992, when maintenance work on the running gear was required. It now resides at the Southeastern Railway Museum in Duluth, Georgia, awaiting visual restoration.
Technical data
General
- Built
- 1926
- Manufacturers
- Lima
- Wheel arrangement
- 4-6-2 (Pacific)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Wheelbase
- 11.28 m
- Total wheelbase
- 22.07 m
- Service mass
- 137.7 t
- Adhesion mass
- 87.3 t
- Total mass
- 228.6 t
- Rigid wheelbase
- 4.27 m
- Axle load
- 29.3 t
- Water capacity
- 41,640 l
- Fuel capacity
- 13.6 t (coal)
Boiler
- Grate area
- 6.578 m²
- Firebox surface
- 30.379 m²
- Tube heating surface
- 310.482 m²
- Evaporative heating surface
- 340.862 m²
- Superheater surface
- 91.974 m²
- Total heating surface
- 432.8 m²
Power plant
- Driver diameter
- 1,880 mm
- Boiler pressure
- 13.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 686 x 711 mm
Power
- Power source
- steam
- Estimated power
- 2,386 kW (3,244 PS)
- Starting effort
- 208.6 kN
Calculated values
- Factor of adhesion
- 1 : 4.11
- Optimal speed
- 71 km/h
- Power-to-weight ratio
- 17.3 kW/t
- Heating Surface Equivalent
- 676.7 m²
- Cylinder volume/HSE
- 1 : 776.44
- Adhesive weight/Total
- 1 : 1.58
- Tractive force/Heating surface
- 1 : 10.06
- Grate area/Heating surface
- 1 : 65.80
- Firebox/Tube surface
- 1 : 10.22
- Total/Superheater
- 1 : 3.71