The SD59MX is remanufactured from the carbody and major mechanical and electrical subsystems of an EMD SD60M "donor". The EFI -equipped 710 engine, however, is all new as are the engine and locomotive control systems.

The EMD SD59M-2 (otherwise known as the SD32ECO or SD59MX; being the Union Pacific designation) is a type of rebuilt, six-axle 3,150 hp diesel locomotive rebuilt by EMD from 2009 to 2011, with production resuming in mid-2012. 25 have been built for the Union Pacific Railroad, rostered as UP 9900-9924. UP 9900 was fitted with catalysts to ...

SD59MX is the Union Pacific designation for this type. BNSF sent 3 SD45-2 locomotives to be rebuilt as SD32ECOs. Unlike UP's SD59MX, BNSF's SD32ECOs retain the appearance of an SD45-2.

Unit # Notes Model Serial # Pictures : UP 9900: The first confirmed EMD Tier 3.5 pre-production test unit. 926302-19: SD59MX 20087146-001

The EMD SD59MX is a diesel locomotive from Electro-Motive Diesel. relatively new onto the railroads, the EMD SD59MX is remanufactured due to carbody and major mechanical and electrical subsystems in an EMD SD60M donor. the EFI-equipped 710 engine, though, is all new as will be the engine and locomotive management systems.

As seen in Trains Magazine FEB 2012. The first confirmed EMD Tier 3.5 pre-production test unit has been released, a UP SD59MX (ECO upgrade SD60M), UP 9900. Union Pacific SD59MX 9900 sits on Display next to CSRM with UP 844 in the Background!. One of the engines sitting on display is the Union Pacific SD59MX #9900, which is a rebuilt SD60M.

Diesel particulate emissions were to be reduced by installing aftertreatment equipment. The aftertreatment device consists of diesel oxidation catalysts (DOC) and diesel particulate filters (DPF) in series, integrated with the experimental EMD 710ECOTM, twelve-cylinder, 3200 bhp, two-cycle engine.

According to Sean Graham-White on the LocoNotes forum, UP has three more SD59MX rebuilds in progress (EMD calls 'em SD59M-2): UP 2453 to UP 9925 UP 2445 to UP 9926

Sep 2, 2013 · Information about the SD59MX here. The EMD SD59M-2, more commonly referred to as the SD59MX, is one of the rarest locomotives in the Union Pacific motive power fleet. SD59M-2s are remanufactured SD60Ms.

Unit # Notes Model Serial # Pictures : UP 9900: The first confirmed EMD Tier 3.5 pre-production test unit. 926302-19: SD59MX 20087146-001