Great Northern class M-1

Great Northern Railway class M-1
GN 1951 at Skykomish, circa 1924
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number34024-34028, 34074-76, 34104-5, 34824-34833, 34965, 34967-68, 34997-99, 35046-35052, 35088-89
ModelBaldwin 16-40/64 DE
Build dateDecember 1909 – August 1910
Total produced35
RebuilderGN shops
Rebuild date1926-1927 (Rebuilt to M-2)
1930 (to O-7 Mikados)
1932 (to O-8 Mikados)
Number rebuilt35 (21 rebuilt to O-7, 3 to O-8)
Specifications
Configuration:
​
 • Whyte2-6-8-0
 • UIC(1′C)D n4v
Gauge4 ft 8+1⁄2 in (1,435 mm)
Driver dia.55 in (1.397 m)
Adhesive weight350,000 lb (160,000 kg)
Loco weight368,700 lb (167,200 kg)
Boiler pressure210 lbf/in2 (1.45 MPa)
CylindersFour, Mallet compound
High-pressure cylinder23 in × 32 in (584 mm × 813 mm)
Low-pressure cylinder35 in × 32 in (889 mm × 813 mm)
Performance figures
Maximum speed35–63 mph (56–101 km/h)
Tractive effort78,360 lbf (348.56 kN)
Career
OperatorsGreat Northern Railway
ClassM-1
Numbers1950–1984
Retired1929–1954
DispositionAll scrapped after rebuilding to class M-2, O-7 & O-8

The Great Northern Railway M-1 was a class of American 2-6-8-0 locomotives introduced in 1910. A total of 35 of these Mallet locomotives were built by Baldwin Locomotive Works for Great Northern Railway (GN) in two batches; the first 10 in December 1909 and a further 25 in June to August 1910.[1] These engines were unusual because of their uneven driving wheel sets, the front having six driving wheels while the rear had eight.

All M-1's were converted from compound to simple-expansion cylinders from 1926 to 1927 and reclassified M-2. 22 M-2's were dismantled between 1929 and 1931, with parts being recycled for the new class O-7 Mikados numbered 3376-3396 in 1930. Three O7 Mikados were rebuilt to O8 Mikados numbered 3397-3399 in 1932. The 13 unrebuilt M-2's lasted until dieselisation and were sold for scrap between 1949 and 1954. No examples were preserved in any form.[2]

Images

  • [1] as M-1.
  • [2] as rebuilt to M-2.

References

  1. ^ Keyes & Middleton 1980, pp. 94, 96.
  2. ^ Keyes & Middleton 1980, pp. 94, 96, 106, 108.
  • Keyes, Norman C. Jr.; Middleton, Kenneth R. (Autumn 1980). "The Great Northern Railway Company: All-Time Locomotive Roster 1861-1970". Railroad History (143). Boston, Massachusetts: The Railway and Locomotive Historical Society, Inc. ISSN 0090-7847.
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