EMD SD9043MAC Diesel Locomotive

| Technical Data Total Built: 400+ Weight: 191 t Length: 80'2" (24.43m) Engine Power: 4,300Hp (3,210kW)
Fuel Capacity: 5,000gal (19,000L)

The SD90MAC was first introduced in 1995, at the same time as the SD80MAC locomotives. The SD90MAC was initially designed to make use of the new 16-cylinder H-engine, whilst the SD80MAC was designed to make use of a 20-cylinder variant of the 710G engine. However, due to the impact of unforeseen techinical problems, a decsion was made for the first locomotives to be shipped with the 710G engine, with an option provided to upgrade these engines in the future. Union Pacific (and the other railroads that purchased them) gave them the informal model designation of SD9043MAC.

Unfortunately, the planned upgrade system was never taken advantage of by SD90MAC buyers, as there were concerns raised regarding the reliability of the engine. As a result, Norfolk Southern and Canadian Pacific ended up purchasing these locomotives from Union Pacific's fleet for SD70ACu rebuilds, but this representation of the SD9043MAC offers a fascinating insight into an interesting variant of one the largest single-engined locomotives produced by EMD.