Firebox heating surface includes 53 sq ft of arch tubes. Piston valves measured 15" in diameter.
Much the biggest engine design delivered to the CGW before the 2-10-4s of the 1930s, these low-drivered engines operated at a relatively low 180 psi.
800's firebox received a makeover in January 1939 during which the number of arch tubes was cut to 18 sq ft total, but 106 sq ft of thermic syphons was added to boost firebox heating surface to 415 sq ft.
(Drury's (1993) tractive effort figure of 43,440 lb is much too low and he is incorrect in his statement that the railroad's Mikados generated considerably more.) Once the Texas engines came on the road in the 1930s, 6 of these drag-freight locomotives were scrapped. The class leader lasted until the end of steam.
| Specifications | |
|---|---|
| Class | M1s |
| Locobase ID | 4179 |
| Railroad | Chicago Great Western (CGW) |
| Whyte | 2-10-2 |
| Road Numbers | 800-806 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1916 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 21.33' |
| Engine Wheelbase | 40.59' |
| Ratio of driving wheelbase to overall engine wheebase | 0.53 |
| Overall Wheelbase (engine & tender) | 75.80' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 280000 lbs |
| Engine Weight | 348600 lbs |
| Tender Light Weight | 185000 lbs |
| Total Engine and Tender Weight | 533600 lbs |
| Tender Water Capacity | 10000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 93 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 60" |
| Boiler Pressure | 180 psi |
| Cylinders (dia x stroke) | 30" x 32" |
| Tractive Effort | 73440 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.81 |
| Heating Ability | |
| Firebox Area | 344 sq. ft |
| Grate Area | 78 sq. ft |
| Evaporative Heating Surface | 4656 |
| Superheating Surface | 1164 |
| Combined Heating Surface | 5820 |
| Evaporative Heating Surface/Cylinder Volume | 177.85 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 14040 |
| Same as above plus superheater percentage | 16848 |
| Same as above but substitute firebox area for grate area | 74304 |
| Power L1 | 11587 |
| Power MT | 456.16 |
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