The firebox on these locom0tives had a combustion chamber, which contributed 120 square feet to overall firebox surface area and 39 square feet of archtubes. There was 6,205 square feet of combined heating surface. Over time the boiler pressure was raised to 200 psi and then raised to 210 psi.
Some of the Class Q-1s were refitted later with a firebox that had 100 sq ft of thermic syphons and 18 sq ft of arch tubes, which contributed to an overall total of 498 sq ft of firebox heating surface. At least two used security circulators in a firebox presenting 477 square feet of direct heating surface. Like most 2-10-2s, these had 14"-diameter piston valves.
In 1946, three more 2-10-2s were added to the ACL roster when the Atlanta, Birmingham & Coast Railroad was merged with ACL. Three AB&C 2-10-2 locomotives (road numbers 401-403) became Class AF-1 and were assigned road numbers 7401-7403.
There are no surviving ACL 2-10-2 "Santa Fe" type locomotives.
|Class||Qty.||Road Numbers||From Other RR||Year Acquired||Year Built||Builder||Notes|
|Q-1||20||2000-2019||1925||Baldwin||Nine of the Class Q-1 locomotives sold to the C&IM in 1951 and became C&IM numbers 751-759. All the others scrapped in 1951-1952.|
|AF-1||3||7401-7403||AB&C||1946||1917||Baldwin||Conveyed from the Atlanta, Birmingham & Coast on 1/1/1946. Ex AB&C numbers 401-403. Numbers 7401-7403 scrapped in 1951-1952.|
Firebox had combustion chamber, which contributed 120 sq ft (11.15 sq m) to overall firebox surface area and 39 sq ft (3.6 sq m) of archtubes. When delivered, the working boiler pressure was set at 195 psi (13.45 bar), which yielded a calculated 75,771 lb (34,369 kg) of tractive effort. Pressure was raised later to 200, then 210 psi.
Some of the class were refitted later with a firebox that had 100 sq ft (9.3 sq m) of thermic syphons and 18 sq ft (1.65 sq m) of arch tubes, which contributed to an overall total of 498 sq ft (46.25 sq m) of firebox heating surface. At least two used security circulators in a firebox presenting 477 sq ft of direct heating surface. Like most 2-10-2s, these had 14" (356 mm)-diameter piston valves.
After service with the Atlantic Coast Line until 1951-1952, 9 of this class went on to serve with the C&IM as class H-2 until that line dieselized.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Atlantic Coast Line (ACL)|
|Number in Class||20|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||22|
|Engine Wheelbase (ft)||42.80|
|Ratio of driving wheelbase to overall engine wheebase||0.51|
|Overall Wheelbase (engine & tender) (ft)||83.01|
|Axle Loading (Maximum Weight per Axle) (lbs)||62,780|
|Weight on Drivers (lbs)||303,060|
|Engine Weight (lbs)||391,380|
|Tender Loaded Weight (lbs)||221,000|
|Total Engine and Tender Weight (lbs)||612,380|
|Tender Water Capacity (gals)||12,000|
|Tender Fuel Capacity (oil/coal) (gals/tons)||16|
|Minimum weight of rail (calculated) (lb/yd)||101|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||63|
|Boiler Pressure (psi)||210|
|High Pressure Cylinders (dia x stroke) (in)||30" x 32"|
|Tractive Effort (lbs)||81,600|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.71|
|Firebox Area (sq ft)||426|
|Grate Area (sq ft)||88.20|
|Evaporative Heating Surface (sq ft)||4975|
|Superheating Surface (sq ft)||1230|
|Combined Heating Surface (sq ft)||6205|
|Evaporative Heating Surface/Cylinder Volume||190.03|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||18,522|
|Same as above plus superheater percentage||22,226|
|Same as above but substitute firebox area for grate area||107,352|