http://www.greatnorthernempire.net/index2.htm?GNEGNPrototypeDrawingsSteam.htm, last accessed 20 October 2007. Works numbers were 57410, 57442, 57517-57532 in November 1923; 57559-57568, 57592-57593 in December.
Big engines in every respect, these Santa Fes had the Belpaire firebox beloved by the Great Northern, 15" piston valves, and lots of weight on the drivers. Their tube & flues had large diameters and the 60 superheater flues were among the most in any boiler. A smallish grate area meant much less to an oil-fired class and they had few rivals in the adhesion weight they could throw into hauling a train.
Most were oil burners as shown in the specs. Delivered with 370 sq ft of heating surface and 5,499 sq ft total, the class later added 39 sq ft of arch tubes and a trailing-truck booster developing 12,200 lb.
All remained in service until the 1950s with the last 3 being withdrawn in December 1957.
Originally delivered to the GNas 4-8-2s in 1914, the entire class was converted to Santa Fes in 1929. In the process, they kept their long boilers with Belpaire firebox stretched by a combustion chamber. Everything else - from the internal arrangement of tubes and flues to the number and diameter of drivers - changed as did their service from heavy passenger to drag freight.
They all lasted into the 1950s, the last five being retired in April 1958.
| Specifications | ||
|---|---|---|
| Class | Q-1 | Q-2 |
| Locobase ID | 8813 | 8814 |
| Railroad | Great Northern (GN) | Great Northern (GN) |
| Whyte | 2-10-2 | 2-10-2 |
| Road Numbers | 2100-2129 | 2175-2189 |
| Gauge | Std | Std |
| Builder | Baldwin | GN |
| Year | 1923 | 1928 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 22' | 22' |
| Engine Wheelbase | 32.83' | 31.33' |
| Ratio of driving wheelbase to overall engine wheebase | 0.67 | 0.70 |
| Overall Wheelbase (engine & tender) | 86.22' | 83.56' |
| Axle Loading (Maximum Weight per Axle) | 69840 lbs | 58000 lbs |
| Weight on Drivers | 342490 lbs | 290000 lbs |
| Engine Weight | 428340 lbs | 364000 lbs |
| Tender Light Weight | 324500 lbs | 315600 lbs |
| Total Engine and Tender Weight | 752840 lbs | 679600 lbs |
| Tender Water Capacity | 17000 gals | 17000 gals |
| Tender Fuel Capacity (oil/coal) | 5800 gals | 5800 gals |
| Minimum weight per yard of rail on which locomotive could run | 114 lb rail | 97 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 63" | 63" |
| Boiler Pressure | 210 psi | 210 psi |
| Cylinders (dia x stroke) | 31" x 32" | 29" x 32" |
| Tractive Effort | 87131 lbs | 76251 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.93 | 3.80 |
| Heating Ability | ||
| Firebox Area | 409 sq. ft | 362 sq. ft |
| Grate Area | 88 sq. ft | 78 sq. ft |
| Evaporative Heating Surface | 5538 | 4825 |
| Superheating Surface | 1518 | 1184 |
| Combined Heating Surface | 7056 | 6009 |
| Evaporative Heating Surface/Cylinder Volume | 198.11 | 197.23 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 18480 | 16380 |
| Same as above plus superheater percentage | 22546 | 19656 |
| Same as above but substitute firebox area for grate area | 104786 | 91224 |
| Power L1 | 16758 | 15585 |
| Power MT | 539.36 | 592.40 |
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