EMD SD39
Boston & Maine 690 (ex Illinois Terminal 2301) with Train EDRJ (East Deerfield–Rotterdam Jct) about to enter Hoosac Tunnel
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An SD39 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between August 1968 and May 1970. 54 were built for American railroads.
In 1966 EMD replaced all their old models with new ones having the new 645 diesel. These included six-axle models SD38, SD40, SDP40 and SD45; the SD39 was added in 1968. All shared standard components including the frame, cab, traction alternator, trucks, traction motors, and air brakes. The difference was the power output: SD38 = Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). from a non-turbocharged V16, SD39 = Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). from a turbocharged V12, SD40 = Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). from a turbocharged V16, and SD45 = Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). from a turbocharged V20. The SD39 had the smallest prime mover and therefore had the most unused space above the frame, inside the hood between the main generator and electrical cabinet, and outside in large end "porches".
Variant
A variant was the SDL39, ordered by the Milwaukee Road. Shorter and lighter than a stock SD39, these minimized weight per axle.
Original owners[1]
| Railroad | Quantity | Road numbers | Notes |
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| Atchison, Topeka and Santa Fe Railway |
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| Illinois Terminal Railroad |
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4 went to Guilford Rail System, all have been scrapped. |
| Minneapolis, Northfield and Southern Railway |
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#40 currently used by Progressive Rail |
| Southern Pacific Transportation Company |
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| Total | 54 |
Dash 2 Rebuilds
On January 1, 1972 EMD debuted Dash 2 models. No SD39-2s were built as new units, but a number of SD39s were rebuilt to Dash 2 specifications.
References
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- Trains Magazine Article December 1968, "A Market Oriented Catalog" by Wallace A. Abbey. The same article appears in Kalmbach's Our GM Scrapbook pages 82–83 subtitle, "Little diesel, big job".
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