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Atlanta & West Point class P-74

United States 1926 2 produced
collection Josh Scott

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
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