Boiler had Coffin feedwater heater wrapped as a collar around the smokebox, valve motion had limited cutoff. Firebox heating surface included 22 sq ft of arch tubes and 99 sq ft of thermic syphons. T-1b (engine numbers 4020-4024) engine weight was 403,000 lb Indeed, by 1947, engine weight had climbed to 406,900 lb for the whole class. Boston and Albany A1 and Illinois Central #7000 very similar.
Drury (1993) comments that the design of the trailing truck, which encouraged derailments and the lack of adhesion on the drivers, which made them slippery, contributed to the railroad's disenchantment with the class.
| Specifications | |
|---|---|
| Class | T1 |
| Locobase ID | 47 |
| Railroad | Boston & Maine |
| Whyte | 2-8-4 |
| Road Numbers | 4000-4024 |
| Gauge | Std |
| Builder | Lima |
| Year | 1928 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.50' |
| Engine Wheelbase | 41.70' |
| Ratio of driving wheelbase to overall engine wheebase | 0.40 |
| Overall Wheelbase (engine & tender) | 80.30' |
| Axle Loading (Maximum Weight per Axle) | 65900 lbs |
| Weight on Drivers | 261800 lbs |
| Engine Weight | 406900 lbs |
| Tender Light Weight | |
| Total Engine and Tender Weight | 0 |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 18 tons |
| Minimum weight per yard of rail on which locomotive could run | 109.08 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 240 psi |
| Cylinders (dia x stroke) | 28" x 30" |
| Tractive Effort | 76160 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.44 |
| Heating Ability | |
| Firebox Area | 405 sq. ft |
| Grate Area | 100 sq. ft |
| Evaporative Heating Surface | 5131 |
| Superheating Surface | 2135 |
| Combined Heating Surface | 7266 |
| Evaporative Heating Surface/Cylinder Volume | 239.99 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 24000 |
| Same as above plus superheater percentage | 31052.02 |
| Same as above but substitute firebox area for grate area | 125760.69 |
| Power L1 | 31082.34 |
| Power MT | 1046.98 |
| This page last modified: . | [Contact] | All material © 1999-2008 SteamLocomotive.com |