Great Northern Railway class M-1
GN 1951 at Skykomish, circa 1924
Type and origin
Power typeSteam
BuilderBaldwin Locomotive Works
Serial number34024–34028, 34074–34076, 34104, 34105, 34824–34833, 34965, 34967, 34968, 34997–34999, 35046–35052, 35088, 35089
ModelBaldwin 16-40/64 DE
Build dateDecember 1909 – August 1910
Total produced35
RebuilderGN shops
Rebuild date1926-1927 (Rebuilt To : M-2) 1930 (Rebuilt To 21 O-7 Mikado's) 1932 (3 Rebuilt To : O-8 Mikado's)
Number rebuilt35 (21 Rebuilt To O-7 Mikado's) (3 Rebuilt to O-8 Mikado's)
Specifications
Configuration:
  Whyte2-6-8-0
  UIC(1′C)D n4v
Gauge4 ft 8+12 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
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 35 American 2-6-8-0 locomotives introduced in 1910. A total of 35 of these Mallet locomotives were built by Baldwin Locomotive Works in two batches; the first 10 in December 1909, followed by a further 25 in June to August 1910.[1] They were early articulateds and worked their entire life on the Great Northern Railway (GN). These engines were unusual because of having two uneven sets of driving wheels; the front set having six driving wheels, and the rear set having eight driving wheels.

All M-1's were converted to be simple-expansion cylinders from 1926 to 1927 and reclassified M-2. Twenty-two of the M-2's were dismantled between 1929 and 1931, with parts being recycled into new class O-7 Mikados numbered 3376-3396 in 1930 . Three O7 Mikado's were rebuilt to O8 Mikados numbered 3397-3399 in 1932 . The 13 M-2's not rebuilt lasted until the dieselisation era, and were sold for scrap between 1949 and 1954. No M-1's have survived into preservation. None of the O-8's that were rebuilt from the O-7's that were once part of the M-1's were preserved either.[2]

Images

  • as M-1.
  • 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. Boston, Massachusetts: The Railway and Locomotive Historical Society, Inc. (143). ISSN 0090-7847.
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