Milwaukee Road class F7
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| Milwaukee Road class F7 | |
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| Class F7 leading the Midwest Hiawatha past Tower B17, Bensenville, Illinois, May 1943 | |
| Power type | Steam |
|---|---|
| Builder | American Locomotive Company |
| Serial number | 69064–69069 |
| Build date | August to September 1938 |
| Total production | 6 |
| Gauge | 4 ft 81⁄2 in (1,435 mm) |
| Driver diameter | 84 in (2,134 mm) |
| Wheelbase | Loco & tender: 89 ft 10 in (27.38 m) |
| Length | 100 ft 0 in (30.48 m) |
| Axle load | 72,250 lb (32.8 tonnes) |
| Weight on drivers | 216,000 lb (98.0 tonnes) |
| Locomotive and tender combined weight | 791,000 lb (358.8 t) |
| Fuel type | Coal |
| Fuel capacity | 50,000 lb (22.7 tonnes) |
| Water capacity | 16,700 US gal (63,200 l; 13,900 imp gal) |
| Boiler pressure | 300 lbf/in² (2.07 MPa) |
| Fire grate area | 96.5 sq ft (8.97 m2) |
| Heating surface: Total | 4,166 sq ft (387.0 m2) |
| Superheater area | 1,695 sq ft (157.5 m2) |
| Cylinders | Two, outside |
| Cylinder size | 23.5 in × 30 in (597 mm × 762 mm) |
| Tractive effort | 50,294 lbf (223.72 kN) |
| Career | Milwaukee Road |
| Number | 100–105 |
| Retired | November 1949 to August 1951 |
| Disposition | All scrapped |
The Milwaukee Road's class F7 comprised six (#100–#105) high-speed, streamlined 4-6-4 "Baltic" or "Hudson" type steam locomotives built by ALCO in 1937–38 to haul the Milwaukee's Hiawatha express passenger trains. Following on from the success of the road's class A 4-4-2s, the F7s allowed the road to haul longer trains on the popular Chicago–Twin Cities Hiawatha routes.
First-built #100 was also the first withdrawn from service, on November 10, 1949; last-built #105 was the final one in service, withdrawn August 10, 1951.
[edit] See also
- CNW Class E-4 - nine very similar 4-6-4 locomotives built for the Milwaukee's Chicago competitor, the Chicago and North Western Railway.
[edit] References
- Benn, Bryan. "Fastest Steam Locomotive". http://germansteam.info/fastestloco.html. Retrieved 2006-01-09.
- Ross, Don. "Chicago Milwaukee St. Paul & Pacific: Class F7 4-6-4 Hiawatha Atlantics". Don's Rail Photos. http://donsdepot.donrossgroup.net/dr474.htm. Retrieved 2006-01-09.
- Hollingsworth, Brian and Cook, Arthur (2001). The Great Book of Trains. Osceola, Wisconsin: MBI Publishing. ISBN 0-7603-1193-5.
- Reed, Brian (1972). Loco Profile 26 - The Hiawathas. Windsor, Berkshire, UK: Profile Publications Ltd.
- Edson, William D. (Spring 1977). "Milwaukee Road Locomotives". Railroad History (The Railway and Locomotive Historical Society, Inc.) (136): 28–129.
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