Wagon-top boiler. Built for hump-yard service; as such they were fitted with flangeless main wheels that allowed them to negotiate sharper curves (up to 16 deg). The design emphasized interchangeability of parts with 2-8-2s already in IC service.
All had 15" piston valves.
Many were rebuilt later into 2-8-2, 2-10-0, 4-8-2 and 0-10-0 designs when later business conditions demanded more speed than they could deliver. Fifteen sets of 2900 cylinder and frames were mated with a 1500-class (2-8-2) boiler and became decapods (3610-3624).
| Specifications | ||
|---|---|---|
| Class | 2601 | 2900 |
| Locobase ID | 460 | 461 |
| Railroad | Illinois Central (IC) | Illinois Central (IC) |
| Whyte | 2-10-2 | 2-10-2 |
| Road Numbers | 2601-2603 | 2900-3000 |
| Gauge | Std | Std |
| Builder | Alco | Lima |
| Year | 1917 | 1921 |
| Valve Gear | Walschaert | Baker |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 22' | 22.33' |
| Engine Wheelbase | 41.17' | 42.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.53 | 0.53 |
| Overall Wheelbase (engine & tender) | 71.56' | 82.83' |
| Axle Loading (Maximum Weight per Axle) | 61500 lbs | |
| Weight on Drivers | 286000 lbs | 296500 lbs |
| Engine Weight | 367000 lbs | 382000 lbs |
| Tender Light Weight | 208600 lbs | |
| Total Engine and Tender Weight | 0 | 590600 lbs |
| Tender Water Capacity | 9000 gals | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 15 tons | 19 tons |
| Minimum weight per yard of rail on which locomotive could run | 95 lb rail | 99 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 63" | 63" |
| Boiler Pressure | 188.50 psi | 190 psi |
| Cylinders (dia x stroke) | 29" x 32" | 30" x 32" |
| Tractive Effort | 68444 lbs | 73829 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.18 | 4.02 |
| Heating Ability | ||
| Firebox Area | 366 sq. ft | 437.30 sq. ft |
| Grate Area | 80.40 sq. ft | 88.31 sq. ft |
| Evaporative Heating Surface | 4677 | 5165 |
| Superheating Surface | 1162 | 1285 |
| Combined Heating Surface | 5839 | 6450 |
| Evaporative Heating Surface/Cylinder Volume | 191.18 | 197.29 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 15155 | 16779 |
| Same as above plus superheater percentage | 18186 | 20135 |
| Same as above but substitute firebox area for grate area | 82789 | 99704 |
| Power L1 | 13726 | 14415 |
| Power MT | 529.03 | 535.91 |
| This page last modified: . | [Contact] | All material © 1999-2008 SteamLocomotive.com |