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 road switchers 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 singly and in multiple unit lashups.

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