Conrail inherited its rare SW1001 fleet from the Reading. Built in November and December 1973, these 1000hp switchers were commonly found on the ex-Reading branches in eastern Pennsylvania and throughout the eastern end of the system. Because of their common use in cab signaled territory, a number were outfitted with cab signal and or LSL equipment.

In 1999, the fleet was divided between Norfolk Southern and CSX. Those assigned to NS were renumbered into the 2100 - 2111 series, while CSX allocated units became 1120 - 1129.
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