Union Pacific Railroad freight train lead with two EMD SD90AC locos, eastbound.

These are the real 6000 HP diesels and not the upgrades to the 6000 HP power plant.

These units have a very interesting sound, the fans.

South African Railfans may mistake the sound for a 25C steam loco {I wish..}.

B.W. Ring, 2001 June 17, Tehachapi Loop, Tehachapi, California.