| Denver & Rio Grande Western K-28 Class | |
| Powertype: | Steam |
| Hatnote: | References: |
| Builder: | American Locomotive Company (ALCO) |
| Builddate: | 1923 |
| Totalproduction: | 10 |
| Whytetype: | 2-8-2 |
| Uicclass: | 1′D1′ h |
| Driverdiameter: | 440NaN0 |
| Weightondrivers: | 1135001NaN1 |
| Locoweight: | As built: 1400001NaN1 Later: 1560001NaN1 |
| Tenderweight: | 985001NaN1 |
| Fueltype: | Coal (Nos. 473 and 476 converted to oil) |
| Fuelcap: | 160001NaN1 |
| Watercap: | 5000usgal |
| Firearea: | 30.171NaN1 |
| Fireboxarea: | 1021NaN1 |
| Superheatertype: | Type A |
| Boilerpressure: | 2002NaN2 |
| Cylindercount: | Two, outside |
| Cylindersize: | 18x |
| Valvegear: | Walschaerts |
| Valvetype: | 110NaN0 piston valves |
| Tractiveeffort: | 27540lbf |
| Factorofadhesion: | 4.12 |
| Locobrakes: | Straight air |
| Trainbrakes: | No. 6 E-T |
| Operator: | Denver and Rio Grande (D&RG) Denver and Rio Grande Western (D&RGW) White Pass and Yukon (WP&Y)<br>Durango and Silverton (D&SNG) |
| Fleetnumbers: | 470–479 |
| Nicknames: | Sports Model |
| Locale: | Colorado, New Mexico & Alaska |
| Preservedunits: | Three (Nos. 473, 476 and 478) preserved on D&SNG, seven scrapped after WW2 |
| Restoredate: | No. 473; 1981 No. 476; 1981, February 2018 No. 478; 1981 |
| Disposition: | Nos. 473 and 476 operational and No. 478 awaiting overhaul |
The Denver and Rio Grande Western K-28 is a class of ten gauge narrow gauge "Mikado" type steam locomotives built in 1923 by the Schenectady Locomotive Works of the American Locomotive Company (ALCO) for the Denver & Rio Grande Railroad. They were the first new narrow gauge locomotives ordered by the railroad since 1903. They initially comprised class E-4-148-S, but were reclassified K-28 in 1924 when the railroad reorganized into the Denver & Rio Grande Western Railroad.
The chassis is of outside-frame design with the drive wheels placed between the two main frames and the steam cylinders and running gear (cranks, counterweights, rods and valve gear) to the outside. This general arrangement was also used on the earlier class K-27 and later class K-36 and K-37 engines.
Among other duties, they were tasked with hauling the express passenger trains over the D&RGW's narrow gauge lines, such as the San Juan from Alamosa to Durango, the Shavano from Salida to Gunnison and The Silverton from Durango to Silverton. The K-28s also operated on the Chili Line from Antonito to Santa Fe until that route was closed in 1941.
During World War II, seven members of the class were purchased by the US Army for use on the White Pass and Yukon Route in Alaska and the Yukon where they were renumbered USA 250 to USA 256. But they did not fare well in the bitter Yukon winters. All seven were withdrawn from service in 1944 (coinciding with the winding-down of military operations, and the return of WP&Y to civilian control) and were barged to Seattle in 1946 for scrapping.
The three locos which remained with the D&RGW, numbers 473, 476 and 478, were assigned to the Durango – Silverton tourist trains from the 1950s onwards. The Durango & Silverton inherited these when it took over the Silverton Branch in 1981.
Due to their smaller size, these engines are often used by the Durango & Silverton for shorter trains, usually the first or last on the schedule, and also for helper service or sectioned trains. Despite being slightly smaller, older and less powerful than the K-36s, the engine crews tend to favor a trip on these engines because the design ALCO used was superior in balance and servicing. Firing can be tricky when the engine is working hard, as the clamshell-style firedoors tend to pull into the backhead of the boiler due to the draft, and if any flues in the boiler are leaking the loss of draft on the fire is much harder to work around than on the K-36 locomotives.
Firing while the engine is working hard is done with a large "heel" pattern, generally with as little coal on the flue sheet as possible, and gradually sloping the fire bed towards the door sheet to the height or higher than the firedoors. This results in the draft being forced through the fire bed in the thinner areas towards the flue sheet, which usually is hindered by the lack of draft between the grates and the arch brick. New firemen sometimes have difficulty learning this because there are fewer training hours available on the K-28 locomotives compared to the railroad's more-used K-36's which have a larger firebox and have more leeway of poor technique.
These locomotives are popular subjects for model railroaders and high-quality scale models in HOn3 and On3 scales have been produced by several manufacturers since the 1950s.
As of June 2022, locomotives 473 and 476 are in active service and have both been converted from coal-burning to oil-burning. Locomotive 478 is on temporary display in the D&SNG roundhouse museum where locomotive 476 was previously placed in, but will eventually undergo a complete overhaul.
The Oahu Railway and Land Company in Hawaii was impressed with the K-28 and ordered four locomotives of the same design which were delivered in 1925 and 1926. These were identical in specification but oil-fired and with minor differences in fittings (slightly shorter tender with an oil tank in place of the coal bunker, smokebox front, air compressor location, headlamp, etc.).[1]
| D&RGW Number | WP&Y Number | Builder's Number | Disposition |
|---|---|---|---|
| 470 | 250 | 64981 | Entered service at White Pass and Yukon Route on December 8, 1942. Scrapped. |
| 471 | 251 | 64982 | Entered service at White Pass and Yukon Route on November 28, 1942. Scrapped. |
| 472 | 252 | 64983 | Entered service at White Pass and Yukon Route on January 14, 1943. Scrapped. |
| 473 | N/A | 64984 | To D&SNG in March 1981. Restored to operating condition in 1981. Operational. Converted from coal-burning to oil-burning and returned to service in May 2021. |
| 474 | 253 | 64985 | Entered service at White Pass and Yukon Route on February 28, 1943. Fell off barge into bay at Haines, Alaska, hence delay of service. Was the only K-28 to not be fitted with steam heat and signal lines for passenger service. Scrapped. |
| 475 | 254 | 64986 | Entered service at White Pass and Yukon Route on December 15, 1942. Scrapped. |
| 476 | N/A | 64987 | To D&SNG in March 1981. Restored to operating condition in 1981. Taken out of service in September 1999. Placed on display at the D&SNG Museum from 1999-2016. Rebuilt between 2016-2018. Operational. Converted from coal-burning to oil-burning and returned to service on May 25, 2022. |
| 477 | 255 | 64988 | Entered service at White Pass and Yukon Route on December 19, 1942. Scrapped. |
| 478 | N/A | 64989 | To D&SNG in March 1981. Restored to operating condition in 1981. Almost swapped with C&TSRR K-36 No. 483 in 2015. Taken out of service in early 2016. Currently on display in the D&SNG Museum. Awaiting a future overhaul. |
| 479 | 256 | 64990 | Entered service at White Pass and Yukon Route on January 10, 1943. Scrapped. |