Probably the most well known switcher from the Conrail roster, the 121 EMD SW1500's were a 1,500 horsepower variation offered by EMD. Inherited from the PC, RDG, IHB and IU, all but five (which were retired and sold in 1982-1984) made it from 1976 to 1996 when a few were retired and sold off to regionals and/or shortlines.

In 1999, the fleet was divided between Norfolk Southern and CSX. Those assigned to NS were renumbered into the 2200-2242 series, while CSX allocated units became 1069-1099. CSX has since traded theirs to LLPX in exchange for higher horsepower road units, and as of mid 2009 NS has begun retiring their fleet of this venerable switcher.
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