All acquired secondhand from L&HR and LV. As the result of an accident, #410 received a new nose made from a N&W high short nose. This resulted in a low nose with notches like an RS11/36. The #401 (ex-L&HR) went to the Arkansas & Missouri Railroad as #58.

In early 1976 through 1977, the Delaware & Hudson found itself with an ever increasing need for extra motive power.  This was due to the newly acquired trackage rights that was brought on by the formation of Conrail.

In March of 1976 and then later in September of that year - the D&H Shops at Colonie, NY were used to store several former Long Island Rail Road high hood ALCo C-420s that were being returned back to their original owner, the Railway Traction Company, as their leases had expired. Seizing the opportunity to gain more ALCo motive power, the D&H leased several of these units for their own use in 1977. All of the locomotives were quickly pressed into service - still wearing their MTA paint scheme, and keeping their original 200-series road numbers - while only receiving a small D&H shield on the sides of the cab to signify their new operator. As these locomotives did not have dynamic brakes, they were mostly used in the northern divisions of the railroad, where the terrain was not quite so mountainous. Their tenure on the Delaware & Hudson was indeed a short one, as by the end of 1977, all the LIRR units were either sold off or leased to other railroads.