Frank Brehm's roster at http://www.wplives.com/motivepower/srosters/Class_201_Roster__/class_201_roster__.html (accessed 3 July 2006) gives details of the class: Five were built by Brooks in 1917 (works #57444-57448) for $52,861 each and 5 more came from Richmond in 1924 (works# 65485-65489). Wartime inflation had taken its toll, however -- unit price for this quintet was $83,405.
They originally took on the Feather River Canyon run between Oroville and Portola, Calif. M-137 s, which could take singly trains that required an M-80 and an MK-60 together, replaced the M-80s in 1931. They then ran over the Northern California Extension between Keddie and Bieber until the end of steam.
| Specifications | |
|---|---|
| Class | M-80 |
| Locobase ID | 3101 |
| Railroad | Western Pacific (WP) |
| Whyte | 2-6-6-2 |
| Road Numbers | 201-210 |
| Gauge | Std |
| Builder | Alco |
| Year | 1917 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 10.33' |
| Engine Wheelbase | 49.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.21 |
| Overall Wheelbase (engine & tender) | 86.48' |
| Axle Loading (Maximum Weight per Axle) | 59250 lbs |
| Weight on Drivers | 356500 lbs |
| Engine Weight | 429500 lbs |
| Tender Light Weight | 212660 lbs |
| Total Engine and Tender Weight | 642160 lbs |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 4000 gals |
| Minimum weight per yard of rail on which locomotive could run | 99.03 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 57" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 23.5" x 32" |
| Low Pressure Cylinders (dia x stroke) | 37" x 32" |
| Tractive Effort | 75112 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.75 |
| Heating Ability | |
| Firebox Area | 444 sq. ft |
| Grate Area | 72.20 sq. ft |
| Evaporative Heating Surface | 4936 |
| Superheating Surface | 1051 |
| Combined Heating Surface | 5987 |
| Evaporative Heating Surface/Cylinder Volume | 307.27 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 14440 |
| Same as above plus superheater percentage | 16974.90 |
| Same as above but substitute firebox area for grate area | 104388.58 |
| Power L1 | 7927.28 |
| Power MT | 294.14 |
| This page last modified: . | [Contact] | All material © 1999-2008 SteamLocomotive.com |