Posted by Greg Poston on November 4, 2010 
Very clean loco's. Great shot! But what is an SD59X?
Posted by ebi on November 4, 2010 
I think this is a former SD60M. EMD rebuild it with an 710ECO engine.
Posted by SSW8089 on November 4, 2010 
I ask the same thing what is a sd59mx?
Posted by on November 4, 2010 
SD59MX is the UP's designation for what EMD is calling the SD32ECO rebuild. Kansas City Southern has received some SD22ECOs (and GP versions as well), which is a similar, though lower horsepower upgrade. The ECO rebuild involves replacing the existing prime mover with an EPA Tier-2 compliant, turbocharged 12 cylinder 710G3B-T2 equipped with Electronic Fuel Injection. The SD60s were originally built with 16-710G3A prime movers. They still use an AR11 alternator for powering the traction motors. There are also electronic, wheel slip and exhaust system upgrades (and modifications to the cooling system judging by the application of the flared radiators, although the KCS SD22s did not receive something similar, possibly due to the lower horsepower). When complete, the SD59MXs will be Tier-2 compliant, reportedly use 25% less fuel and 50% less lube oil. Also, the maintenance cycle will be 184-day instead of 92-day.
Posted by cmdrflake on November 4, 2010 
Now that Caterpillar is in charge, projects like this will be a very important part of EMD's business. Now, 9909 looks like an SD70M (v.2.0)
Posted by Larry Amaloo on November 4, 2010 
Great shot, I saw those 2 going east on CN M392 in Wellsboro Indiana
Posted by Renee on November 8, 2010 
Now that we have a full explanation of what an SD59MX is, how much hp does it have and is this something other roads will be adding to their roster soon?
Posted by Train_Man on December 14, 2012 
SD59MXs per UP Motive Power, from, Notes & Credits #1 SD60M repowered EMD V12 710ECO engine, 3800hp. #2508 renumbered to #9909. EMD list of locomotives I found on Wikipedia gives you the model, build yr, aaa wheel, and power output.
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