Milwaukee Road class F6a

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Milwaukee Road class F6a
Milwaukee Road class F6a
Milwaukee Road F6a locomotive #6417. Photo by Otto Perry at Chicago, Illinois on September 25, 1935.
Power type Steam
Builder Baldwin Locomotive Works
Serial number 61655–61662
Build date October–November 1931
Gauge 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 19521954

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.