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Norfolk and Western M Class
N&W M Class No. 475 on the Strasburg Rail Road
Type and origin
Power type
Steam
Builder
Baldwin Locomotive Works (50); ALCO-Richmond (75)
Build date
1906-1907
Total produced
125
Specifications
Configuration:
• Whyte
4-8-0
• UIC
2'D
Gauge
4 ft 8+1⁄2 in (1,435 mm)
Leading dia.
27 in (686 mm)
Driver dia.
56 in (1,422 mm)
Length
74 ft 11+3⁄4 in (22.85 m)
Height
15 ft 5 in (4.70 m)
Adhesive weight
168,000 lb (76 tonnes)
Loco weight
200,000 lb (90.7 tonnes)
Fuel type
Coal
Fuel capacity
40,000 lb (18.1 tonnes)
Water cap.
12,000 US gal (45,000 L; 10,000 imp gal)
Boiler pressure
200 psi (1,400 kPa)
Heating surface
2,940 sq ft (273.1 m2)
Cylinders
Two
Cylinder size
21 in × 30 in (533 mm × 762 mm)
Valve gear
Stephenson (inside); Some later converted to Baker
Valve type
12-inch (300 mm) piston valves
Performance figures
Tractive effort
40,163 lbf (178.65 kN)
Career
Operators
Norfolk and Western Railway
Class
M
Numbers
375–499
Retired
1926 - 1958
Preserved
Two (Nos. 475 and 433) preserved, remainder scrapped
Disposition
No. 475 operational on the Strasburg Rail Road and No. 433 on display
Norfolk and Western M1 Class
Type and origin
Only differences from class M above are shown
Power type
Steam
Builder
Baldwin (50), ALCO-Richmond (50)
Build date
1907
Total produced
100
Specifications
Valve gear
Walschaerts
Career
Operators
Norfolk and Western Railway
Class
M1
Numbers
1000–1099
Retired
1956, 1957
Disposition
All scrapped
Norfolk and Western M2 Class
N&W No. 1138 shortly after it was constructed by the Baldwin Locomotive Works
Two (Nos. 1118 and 1134) preserved (+ an M2c, No. 1151), remainder scrapped
The Norfolk and Western M, M1 and M2 Classes were a series of 4-8-0 steam locomotives owned and operated by the Norfolk and Western Railway (N&W). The M Classes were primarily assigned to pull the N&W's mainline freight trains, but following the introduction of the railway's Y Class 2-8-8-2's, the M Classes were reassigned to short line freight service.
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