I am not a rivot counter but do like to stay somewhat close to reality. I have a SD-60M 2 window Vomit Bonit that I am thinking of striping down and modifying into a ATSF SD-70. From a Distance they are somewhat close. I think I remember hearing the 70 series are longer but what other differences are there? Thanks for the help. Bryan
Although the two locomotives may seem similar at first glance, there are many external changes and internal changes between the two. The SD60 and SD70 series locomotive have different trucks. The SD70's ride on the EMD HTCR truck side frames (which there are two styles of) and the 60's ride on another. There are also external body changes such as the blower housing, the walkway level, the rear grill arrangement and last but not least the SD70 is a few feet longer then the SD60 I believe. So if your not a rivit counter, you could probibly pull an SD60 and not really have to worry about the trucks and what ever else. I made a UP SD70M and made a TON of modifications, including the trucks. Get some photo's, compare, and do as much work as you see fit. Have fun!
Some internal difference between the two: SD60 has a 16 cylinder 710G 2-stroke GM prime mover SD70 has a 16 cylinder 710G3B 2-stroke GM prime mover SD60s ride on HTC trucks. These are the same trucks found on the SD38-2, SD39-2, SD40-2, SD45-2, and SD50
okay lets see here Trucks HP Length SD60M = 71.2 Foot SD70M = 72.4 Foot Blower Duct Radiators (SD70M has a extra small section in the back) Walkways are differnt Differnt Computers (unless your dealing with late CR SD60Ms) And finally the hood doors are differnt
Also for Craig Im not trying to bash you but there are 5 distinct versions of the HTCR-II trucks. (though EMD doesnt reconize the differnces)
Here are some good photo links UP SD60M http://www.widowcreek.com/wcrr/unionpacific/locomotives/SD60M/roster.cfm ******** BNSF SD-60 and SD-70 http://www.qstation.org/abpr/bnsf/bnsf_emd.html#SD60M ********* SP SD70M http://espee.railfan.net/spsd70m.html ******** eNjoy Don B
Do you mean ATSF SD-75M? Santa Fe never owned any SD-70's. If you did mean SD-75M I have done one of these. I can't say that it was all that hard, but it is a "kitbash". Fortunately you can order most of the componets from Atlas. For trucks you may be able to fit on some from a Kato SD-90, I'm still looking in to that one though. Brian
<blockquote>quote:</font><hr>Originally posted by bmalonef45: I am not a rivot counter but do like to stay somewhat close to reality. I have a SD-60M 2 window Vomit Bonit that I am thinking of striping down and modifying into a ATSF SD-70. From a Distance they are somewhat close. I think I remember hearing the 70 series are longer but what other differences are there? Thanks for the help. Bryan<hr></blockquote> First off, some dimensions; Length over pulling faces: SD60 71' 2" SD60M 71' 7" SD70 72' 4" Like others have pointed out already, 70-series units ride on HTC-R Radial trucks, of which there are several phases, so you'll have to check photos to be sure which units have which. Off the top of my head, I think most early SD70/70M/75M production (EMD Demo, IC, SP, early NS, early ATSF) have the first style; I might be mistaken, so let photos be your guide. All SD60's ride on HT-C trucks (with the exception of Demo unit EMD #3, which is equipped with HTC-R's). As for other external differences of the SD70: 1. Battery boxes relocated to fireman's side walkway behind cab on SD70 series 2. Different blower bulge 3. SD70 has intake for rear traction motor blower on rear on long hood, underneath radiator intake, fireman's side 4. Lack of walkway traction motor blower air duct on fireman's side 5. Additional "bulge" on engineer's side of hood, opposite of fireman's side blower bulge (SD75M/I only) 6. Different arrangement of long hood doors 7. Different inertial air filter hatch Those are all the major external differences I can think of...the major ones to catch on a model would be the blower bulge(s), the relocated battery boxes, lack of walkway duct, HTC-R trucks, and the additional intake for the rear traction motor blower.
