The SD70MAC is slightly longer than the SD70M, as well as having a few SD60-ish features, like the angled blower bulge. The extra length is most apparent in the extra hood length aft of the radiator intakes. As for the UP SD70M controls, they are desktop style, with analog gauges (at least on the couple I\'ve been aboard).-Nameless Modeler

The RA SD70M-2s didn't fit in with FEC's paint at the time, but I always like the red, white and blue, especially if there was a matching pair together. 106 in happier times: 12/28/2009 Jacksonville, FL with train 101, note with the as delivered RA nose herald. 5/14/2014 Fort Lauderdale with train 121, now minus the nose herald.

Between the SD70ACe and the SD70M-2, the only difference I know of is in the electrical cabinet behind the cab on the conductor's side. An ACe has two large panel covers with grilles in them, whereas an M-2 has three panel covers with no grilles, just oval hand holes. At least that holds true for the prototypes, I can't speak for production units.

> > SD70M's are on lease to the I&O in the first > place > > because the lease payments are high. In the 1990s, NYSW was hauling a lot of freight between Little Ferry and Binghamton, and beyond. They used B40-8 units, the SD70M units, and a …

A very smooth-riding, good-pulling unit quieter on the inside than a straight SD70M, louder of course than an EMD unit with the isolated "Whisper Cab", with the melodious, spine-tingling Nathan K5LLA five-chime air horn. Everything worked perfectly. I like the UPRR's SD70ACes, but found the SD70M-2 to be just as good as an SD70M--I liked it.

SD70M has a wide cab. SP and UP units were/are SD70M\'s. Some SD70M\'s have flared radiators. There were/are no SD70M\'s painted ATSF or BNSF. SD75M looks much like the SD70M, but has another square bulge on the right flank (engineer\'s) side. ATSF and BNSF ran/run these and are mostly red & silver "warbonnet" (although some are being repainted ...

If I remember correctly, when UP took over SP, they found most of the SP units--except the SD40M-2's, SD70M's, Dash 9-44CW's and AC4400CW's new in service since 1994--to be in pretty bad condition. Small wonder why UP scrapped many of them and bought over 1,000 SD70M's as replacements.

> SD70M's? As delivered: 4000 thru 4278 = P3 4285 thru 4384 and 4562 thru 4604 = K5 All the rest = K3 Of course, over time, horns get changed. A few of the SD70Ms now have Leslie S3s, and some of the others have been swapped around with various Nathans.

The SD70M's are good flat land locomotives, when on mountain grades they do not hold a candle to the AC units in power or DB. If you have a train 3x2 DPU with 3 out of the 5 being SD70M DC units you can definitely tell the difference in power and …

Re: NS SD70M-2's Author: NSDTK There is a AC conversion program in the works for those, So reactivation as DC gives them time to shake the issues out of the prime movers.