Milwaukee Road class F6a
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 Milwaukee Road F6a locomotive #6417. Photo by Otto Perry at Chicago, Illinois on September 25, 1935. |
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| Power type | Steam |
|---|---|
| Builder | Baldwin Locomotive Works |
| Serial number | 61655–61662 |
| Build date | October–November 1931 |
| Gauge | 4 ft 8½ in (1435 mm) |
| Leading wheel size | 36 in (914 mm) |
| Driver size | 79 in (2007 mm) |
| Trailing wheel size | 43 in (1092 mm) |
| Wheelbase | 40 ft 9 in (12.42 m) |
| Height | 15 ft 6 in (4.72 m) |
| Locomotive weight | 375,850 lb (170,483 kg) |
| Tender capacity | 20 tons coal (18,000 kg) |
| Boiler pressure | 225 psi (1.55 MPa) |
| Cylinders | 2 |
| Cylinder size | 26 in dia × 28 in stroke |
| Valve gear | Baker valve gear |
| Tractive effort | 45,820 lbf (203.82 kN) |
| Career | Milwaukee Road |
| Number in class | 8 |
| Number | 6414–6421; renumbered 142–146, 139–141 in 1938 |
| Retired | 1952–1954 |
The Milwaukee Road's class F6a comprised eight steam locomotives of the 4-6-4 configuration, commonly nicknamed "Hudson" but known as "Baltic" on the Milwaukee.
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