In 1921 Baldwin delivered another "Santa Fe" which was intended for use in passenger service as well as for freight and it was assigned road number 473 and put into Class K. This locomotive had 58" diameter drivers, 26" x 28" cylinders, a 185 psi boiler pressure, it exerted 51,300 pounds of tractive effort and weighed 277,270 pounds. Another Baldwin-built 2-10-2 similar to 473 was delivered in 1922 and was assigned road number 474.
The Class K locomotive's boiler was a straight top design containing a fire tube superheater. They had a combined heating surface of 4,032 square feet and were rated at 1,670 tons up a 1% grade at slow speed. Steam was delivered through 14" diameter piston valves.
There are no surviving A&V 2-10-2 "Santa Fe" type locomotives.
| Class | Qty. | Road Numbers | Year Built | Builder | Notes |
|---|---|---|---|---|---|
| K | 2 | 470-471 | 1919 | Baldwin | 1 |
| K | 1 | 472 | 1920 | Baldwin | 1 |
| K | 1 | 473 | 1921 | Baldwin | 1 |
| K | 1 | 474 | 1922 | Baldwin | 1 |
Data from the 1926 Alabama & Vicksburg locomotive diagram book supplied in March 2004 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 59, pp. 74+ and Volume 68, pp. 121+; and "New Santa Fe Type Locomotive for the Alabama & Vicksburg Railroad", Railroad and Locomotive Engineering, Volume XXXII [32], No 10 (October 1919), p..289 (Thanks to Chris Hohl for his 6 January 2018 pointing out the differences in wheelbases and engine weights between the two batches His 31 March 2018 email reported the correct tender weights, capacities, and driver diameters.) Works numbers were 51646 in March 1919, 51698 in April and 55478-55479 in May 1922. An additional K-class locomotive -- 51676 in April 1919 -- went to the affiliated Vicksburg, Shreveport & Pacific with road number 471.
These five small Santa Fes were delivered singly at first in 1919 and as a pair in 1922); the last pair had Young valve gear when they arrived, but Walschaert gear soon replaced the mechanism.
They were rated at 1,670 tons up a 1% grade at slow speed over 75 lb/yard (37.5 kg/metre rail. Steam was delivered through 14" (356 mm) diameter piston valves rigged for an impressive 9" (229 mm) travel. Although the boiler included a Gaines combustion chamber, Baldwin does not show a heating surface area. Four American security arch tubes added 33 sq ft (3.07 sq m) to the basic firebox heating surface area.
The first three rolled on the wheelbase shown in Locobase's spec, while that of the latter two was 6" (152 mm) longer in both driving and engine wheelbases with drivers measuring 58" (1,473 mm) in diameter.. The greater length seems to added five tons (4,536 kg) to both the adhesion and engine weights. Loaded tender weight increased to 185,000 lb (83,915 kg).
When absorbed into the Illinois Central, they were given numbers 3100-3104 and converted to 0-10-0 switchers for Chicago's huge Markham Yard. The IC 4 - 1930 Locomotive Diagrams book (also supplied by Allen Stanley) is the source for the firebox heating surface.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | K |
| Locobase ID | 6083 |
| Railroad | Alabama & Vicksburg |
| Country | USA |
| Whyte | 2-10-2 |
| Number in Class | 5 |
| Road Numbers | 470-474 |
| Gauge | Std |
| Number Built | 5 |
| Builder | Baldwin |
| Year | 1919 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 20.33 / 6.20 |
| Engine Wheelbase (ft / m) | 24 / 7.32 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.85 |
| Overall Wheelbase (engine & tender) (ft / m) | 67.58 / 20.60 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 45,180 / 20,493 |
| Weight on Drivers (lbs / kg) | 218,400 / 99,065 |
| Engine Weight (lbs / kg) | 274,720 / 124,611 |
| Tender Loaded Weight (lbs / kg) | 154,000 / 69,853 |
| Total Engine and Tender Weight (lbs / kg) | 428,720 / 194,464 |
| Tender Water Capacity (gals / ML) | 10,000 / 28.41 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 16 / 13 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 73 / 36.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 185 / 1280 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 26" x 28" / 660x711 |
| Tractive Effort (lbs / kg) | 52,218 / 23685.71 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.18 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 215 - 2" / 51 |
| Flues (number - dia) (in / mm) | 32 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 19.25 / 5.87 |
| Firebox Area (sq ft / m2) | 257 / 23.88 |
| Grate Area (sq ft / m2) | 58.70 / 5.45 |
| Evaporative Heating Surface (sq ft / m2) | 3278 / 304.53 |
| Superheating Surface (sq ft / m2) | 754 / 70.05 |
| Combined Heating Surface (sq ft / m2) | 4032 / 374.58 |
| Evaporative Heating Surface/Cylinder Volume | 190.47 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 10,860 |
| Same as above plus superheater percentage | 12,923 |
| Same as above but substitute firebox area for grate area | 56,579 |
| Power L1 | 11,590 |
| Power MT | 584.97 |
