The Rio Grande also operated a standard gauge railroad and bought many powerful locomotives that included twenty-one 4-6-6-4 "Challenger" type and forty-five 2-8-8-2 "Chesapeake" type.
The Rio Grande ordered ten "Santa Fe" type locomotives for it standard gauge railroad, which the American Locomotive Company delivered in 1917. These 2-10-2s were put to work in helper service on Tennessee Pass and on Pueblo to Denver coal trains. They were designated as Class F-81 and were given road numbers 1400 through 1409. The locomotives had 63" diameter drivers, 31" x 32" cylinders, a 195 psi boiler pressure, they exerted 80,907 pounds of tractive effort and each weighed 428,500 pounds. The firebox had security brick arch and the combined heating surface was 6,698 square feet.
The ten F-81s were used in helper service in Minturn-Malta (Tennessee Pass), Colorado and on through-freight trains between Denver and Salida.
There are no surviving D&RGW 2-10-2 "Santa Fe" type locomotives.
|Class||Qty.||Road Numbers||Year Built||Builder||Notes|
|F-81||10||1400-1409||1917||ALCO||Numbers 1408 & 1409 scrapped in 1952, number 1404 scrapped in 1954 and all of the others were scrapped in 1955.|
Firebox had Security brick arch and Street (later Duplex) stoker. A requirement that these engines handle 16-deg curves was met by spacing the drivers of the first, main, and last pairs (every other one, in other words) 1/4" closer together (down to 53 1/8") and the second and fourth at 53 3/8". The front drivers also rode in a Woodward floating front driving axle, which reduced rigid wheelbase to 16 feet, 6 inches (5.03 m).
When introduced, five were used in Minturn-Malta (Tennessee Pass), Colorado helper service for trains tackling the ruling 3% grade and the other five ran through-freights between Denver and Salida (ruling grade 1.42%).
The class went through few changes, although a later update reshaped the firebox heating surface area to add 96 sq ft (8.9 sq m) of thermic syphons to the 324 sq ft (80.1 sq m) of the basic furnace and combustion chamber.
By the 1950s, all had turned in their Vanderbilt cylindrical tenders in favor of rectangular tenders of similar capacity. Adhesion weight climbed to 353,700 lb (160,436 kg) and engine weight increased to 438,400 lb (198,855 kg). 1406 now used security circulators instead of syphons.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Denver & Rio Grande Western (D&RGW)|
|Number in Class||10|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.54|
|Overall Wheelbase (engine & tender)||76.80'|
|Axle Loading (Maximum Weight per Axle)||72100 lbs|
|Weight on Drivers||337500 lbs|
|Engine Weight||428500 lbs|
|Tender Light Weight||286480 lbs|
|Total Engine and Tender Weight||714980 lbs|
|Tender Water Capacity||16000 gals|
|Tender Fuel Capacity (oil/coal)||23 tons|
|Minimum weight of rail (calculated)||113 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||195 psi|
|Cylinders (dia x stroke)||31" x 32"|
|Tractive Effort||80907 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.17|
|Firebox Area||368 sq. ft|
|Grate Area||88 sq. ft|
|Evaporative Heating Surface||5369 sq. ft|
|Superheating Surface||1329 sq. ft|
|Combined Heating Surface||6698 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||192.06|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||17160|
|Same as above plus superheater percentage||20592|
|Same as above but substitute firebox area for grate area||86112|