In 1943, the Lima Locomotive Works delivered the eight Class K Northerns (road numbers 451 through 458) and C of G put these 73" driver 4-8-4s to work on its passenger trains like the "Dixie Flyer" and the "Seminole". They became known affectionately as "Big Apples".
These locomotives weighed 447,200 lbs, had 27 x 30 cylinders, 250 lbs psi boiler pressure and a tractive effort of 62,300 lbs.
Firebox heating surface included 70 sq ft (6.5 sq m) of thermic syphons and 15 sq ft (1.4 sq m) of arch tubes. Drury (1993) notes that these wartime engines are often described as near-duplicates of the Espee's GS-6 (Locobase 282). The boiler layout differed, however, as the Ks had more small tubes and fewer flues that had 1/2" (12.7 mm) greater outside diameter. Another principal difference was the use of the Elesco feedwater heater. Piston valves measured 12" (306 mm) in diameter.
On the Central of Georgia, the class was nicknamed the "Big Apples." Alexander (American Locomotives, 1950) adds that they cost $178,000 each and could "maintain fast schedules between Macon [Georgia] and Atlanta with 22 passenger cars northbound or thirty cars southbound." Their coal consumption was measured at 100 lb for every 1,000 gross ton miles or 11.4 lb/passenger-car mile.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Central of Georgia (CofGa)|
|Number in Class||8|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.44|
|Overall Wheelbase (engine & tender)||83.50'|
|Axle Loading (Maximum Weight per Axle)||65000 lbs|
|Weight on Drivers||260000 lbs|
|Engine Weight||447200 lbs|
|Tender Light Weight||246600 lbs|
|Total Engine and Tender Weight||693800 lbs|
|Tender Water Capacity||13000 gals|
|Tender Fuel Capacity (oil/coal)||21 tons|
|Minimum weight of rail (calculated)||108 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||250 psi|
|Cylinders (dia x stroke)||27" x 30"|
|Tractive Effort||63230 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.11|
|Firebox Area||435 sq. ft|
|Grate Area||90.40 sq. ft|
|Evaporative Heating Surface||4705 sq. ft|
|Superheating Surface||2059 sq. ft|
|Combined Heating Surface||6764 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||236.67|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||22600|
|Same as above plus superheater percentage||29380|
|Same as above but substitute firebox area for grate area||141375|