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. |
Data from 1930 Locomotive Cyclopedia and ACL 3 -1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 75, pp 54+. (Many thanks to Chris Hohl for his 22 September 2017 email reporting unlikely boiler pressure values for 177 entries. A Locobase macro caused the error. Hohl's 2 April 2023 email corrected the driving wheelbase.) Works numbers were 58647-58650 in September; 58729-58734, 58745-58747, 58768-58769 in October; 58875-58876, 58896-58898 in December
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) from five 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, Nine of this class were sold to locomotive rebuilder/reseller Georgia Car & Locomotive. Between 1951 and mid-1953, GC&L sold all nine to the Chicago & Illinois Midland. 2000 and 2016 went first on 14 January 1951. 2013-2104 followed on 23 November and 2007 and 2018 finished 1951 on 19 December. Each of these six cost between $33,500 and $37,500 and took road numbers 704-709. The next 18 months undoubtedly produced a supply glut in the market, driving prices down. C&IM bought the last three on 25 May 1953, paying 25,500 for the first two (ex-2011 and 2019) and $16,500 for the last (ex-20050. The entire class was renumbered in 1953 as 751-759.
Designated H-2, the ex-ACL Santa Fes remained in C&IM service until it fully dieselized, at which point the H-2s entered retirement together on 31 December 1955 along with the other eighteen 2-10-2s..
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Q-1 |
| Locobase ID | 72 |
| Railroad | Atlantic Coast Line (ACL) |
| Country | USA |
| Whyte | 2-10-2 |
| Number in Class | 20 |
| Road Numbers | 2000-2019 |
| Gauge | Std |
| Number Built | 20 |
| Builder | Baldwin |
| Year | 1925 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 22.83 / 6.96 |
| Engine Wheelbase (ft / m) | 42.75 / 13.03 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.53 |
| Overall Wheelbase (engine & tender) (ft / m) | 83.08 / 25.32 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 62,780 / 28,477 |
| Weight on Drivers (lbs / kg) | 303,060 / 137,466 |
| Engine Weight (lbs / kg) | 391,380 / 177,527 |
| Tender Loaded Weight (lbs / kg) | 221,000 / 100,244 |
| Total Engine and Tender Weight (lbs / kg) | 612,380 / 277,771 |
| Tender Water Capacity (gals / ML) | 12,000 / 45.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 16 / 15 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 101 / 50.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 210 / 1450 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 30" x 32" / 762x813 |
| Tractive Effort (lbs / kg) | 81,600 / 37013.18 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.71 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 256 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 50 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 20.50 / 6.25 |
| Firebox Area (sq ft / m2) | 426 / 39.58 |
| Grate Area (sq ft / m2) | 88.20 / 8.19 |
| Evaporative Heating Surface (sq ft / m2) | 4975 / 462.19 |
| Superheating Surface (sq ft / m2) | 1230 / 114.27 |
| Combined Heating Surface (sq ft / m2) | 6205 / 576.46 |
| 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 |
| Power L1 | 15,308 |
| Power MT | 556.79 |
