The GP15-1 was a somewhat unique locomotive. It was offered by EMD as a competitor not to another manufacturer's product line, but to railroads own rebuilding of older geeps. Conrail's fleet of 100 of these lightweight roadswitchers arrived numbered in the 1600 series in 1979. These units could be found system wide in use in their intended role as light road switchers working various locals both individually and in multiple unit consists.

In 1999, the entire fleet was divided between Norfolk Southern and CSX. Those assigned to NS were renumbered into the 1400-1457 series, while CSX allocated units became 1525-1566. Norfolk Southern units went on to become property of LTEX and GMTX, while CSX sold 1525-1533 and 1564-1566 to LLPX, while 1534-1563 are still in service on CSX.

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