Although the B & LE liked its Santa Fes as they came off the production line, the design wasn't allowed to stand completely still. Later modifications included a large combustion chamber that contributed 129 sq ft to total firebox heating surface. In addition, 3 thermic syphons added 99 sq ft of direct heating surface; two of these served the firebox, one the combustion chamber. The firebox also retained its 27 sq ft of arch tubes.
Perhaps one reason the B & LE liked these Santa Fes better than those designed by the USRA (See Locobase 9030) was the provision of 16" piston valves and Baker valve gear. They also put 20 more tons of adhesive weight on the rails than did the USRAs. In any event, most of the class saw steam out on the B & LE.
Although the quintet of engines from Baldwin were USRA Santa Fes when they came on the road, later modifications added considerably to their direct heating surface. A similar program was applied to the D1As (this modification is described in Locobase 7655).
The 104 sq ft combustion chamber received one of 3 thermic syphons; the other two were placed in the cavernous firebox, which retained its 27 sq ft of arch tubes. All three thermic syphons contributed 110 sq ft of firebox heating surface. 14" piston valves actuated by Southern valve gear let the steam into the cylinders.
Drury (1993) comments that these engines weren't as well liked as the pre-Great War D1As and were retired before those engines were withdrawn. (There were 4 times as many of the D1As, which may have had something to do with it.)
| Specifications | |||
|---|---|---|---|
| Class | D1A | D1A - syphons | D2A |
| Locobase ID | 5435 | 7655 | 9030 |
| Railroad | Bessemer & Lake Erie | Bessemer & Lake Erie | Bessemer & Lake Erie |
| Whyte | 2-10-2 | 2-10-2 | 2-10-2 |
| Road Numbers | 501-520 | 501-520 | 521-525 |
| Gauge | Std | Std | Std |
| Builder | Baldwin | B&LE | Baldwin |
| Year | 1916 | 1940 | 1916 |
| Valve Gear | Baker | Baker | Southern |
| Locomotive Length and Weight | |||
| Driver Wheelbase | 21.33' | 21.33' | 22.33' |
| Engine Wheelbase | 40.58' | 40.58' | 42.17' |
| Ratio of driving wheelbase to overall engine wheebase | 0.53 | 0.53 | 0.53 |
| Overall Wheelbase (engine & tender) | 77.70' | 77.71' | 82.83' |
| Axle Loading (Maximum Weight per Axle) | 67950 lbs | 61475 lbs | |
| Weight on Drivers | 332700 lbs | 334250 lbs | 294475 lbs |
| Engine Weight | 404250 lbs | 407550 lbs | 384225 lbs |
| Tender Light Weight | 180750 lbs | 190750 lbs | 207100 lbs |
| Total Engine and Tender Weight | 585000 lbs | 598300 lbs | 591325 lbs |
| Tender Water Capacity | 10000 gals | 10000 gals | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons | 20 tons | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 111 lb rail | 111 lb rail | 98 lb rail |
| Geometry Relating to Tractive Effort | |||
| Driver Diameter | 60" | 64" | 63" |
| Boiler Pressure | 200 psi | 210 psi | 190 psi |
| Cylinders (dia x stroke) | 30" x 32" | 30" x 32" | 30" x 32" |
| Tractive Effort | 81600 lbs | 80325 lbs | 73829 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.08 | 4.16 | 3.99 |
| Heating Ability | |||
| Firebox Area | 431 sq. ft | 514 sq. ft | 524 sq. ft |
| Grate Area | 88 sq. ft | 88 sq. ft | 88.20 sq. ft |
| Evaporative Heating Surface | 5191 | 5252 | 5251 |
| Superheating Surface | 1237 | 1237 | 1230 |
| Combined Heating Surface | 6428 | 6489 | 6481 |
| Evaporative Heating Surface/Cylinder Volume | 198.28 | 200.61 | 200.57 |
| Computations Relating to Power Output (More Information) | |||
| Robert LeMassena's Power Computation | 17600 | 18480 | 16758 |
| Same as above plus superheater percentage | 21120 | 22176 | 20110 |
| Same as above but substitute firebox area for grate area | 103440 | 129528 | 119472 |
| Power L1 | 14117 | 16218 | 14434 |
| Power MT | 467.73 | 534.85 | 540.31 |
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