An Illinois Central locomotive sits in fresh paint. Photo credit Illinois-Central.Net
SD70MAC: an SD70M with an alternating-current (A. C.) drive system. Now one might think that an SD70 MAC with the additional 'WhisperCab' feature would be called an SD70 IMAC, but an IMAC is an Apple Macintosh computer. The EMD SD70 is a series of diesel-electric locomotives produced by Electro-Motive Diesel in response to the GE Dash 9-44CW.Production commenced in late 1992 page needed and since then over 5,700 units have been produced; most of these are the SD70M and SD70MAC models. Sep 20, 2006 EMD SD70MAC; Data Sheet Information Compiled by: R. Craig: New: 20 September 2006: Artwork by: Jean-Denis Bachand-Engine Builder: EMD: Engine: 710G3C-ES 16 cylinder.
The SD70 was EMD's entrance into the 1990s with the now-faithful 710G3 engine. With a new transition from the SD60, SD60M, and SD60I, Electro-Motive now offered most optional features (like extended range dynamic brakes) as standard; the major change, however, came in the High Traction Control-Radial (HTC-R) truck, experimented with a lone SD60 engine and the experimental SD60MAC, was now standard issue on the SD70 series.
Three demonstrator SD70Ms, 7000-7002, show off their power on a loaded coal train (with a research passenger car behind it) in May of 1993 in Manchester, Georgia. Photo credit Casey Thomason
With new federal law requirements, all locomotives were mandated to have the wide cab that was only optionally offered by Electro-Motive. (Most railroads purchased the wide cab around this time anyways for crew comfort and for better visibility.) This new law led to the SD70M and AC-relative locomotive SD70MAC. Like the SD60I, railroads also requested an isolated cab version of this locomotive, and thus the SD70I was created. Canadian National railroad was the sole purchaser of the SD70I locomotive
A Canadian National SD70I sits with a coal train in Chicago, Illnois, pictured in fresh paint in January of 1996. Photo credit Eric Larson
Later SD70M locomotives featured a more angular cab that was used on the SD70ACe along with flared radiators (much like the SD45.
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A late production Union Pacific SD70M sits 11 months after it was built relatively clean in a Kansas City, Kansas yard. Notice the flared radiators and newly design cab. Union Pacific was a major purchaser of the SD70M locomotive type. Photo credit Warren Calloway
Total production of the original DC SD70 series from 1992 to 2005 came out to 122 SD70s (standard cab), 1609 SD70Ms, and 26 SD70Is.
Kline Sd70 Mac Owners ManualPT-Specific Information
Sd70mac Manual FreeNotes
⚠: Not Verified or Educated Guess
(1): Late SD70s were rated at 4300 horsepower.
Sd70mac Manuals
Mcintosh mac 1900 manual. (2): Later units were produced with fully automatic starters.
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