The Delaware & Hudson originally connected Montreal with Albany, Oneonta, Binghamton and Scranton/Wilkes-Barre. It remained solvent despite the collapse of other northeastern roads in the 1970s.
To provide token competiton for Conrail, the D&H was given trackage rights:
Binghamton to Buffalo via ex-EL
Scranton to Oak Island via ex-LV
Sunbury to Potomac Yard via ex-PC/Enola PA
At that time they were basically given the former PRR from Wilkes-Barre to Sunbury, as part of their route to Potomac Yard. I'd have to get out a map to be 100% sure of the routing, but the road basically doubled or tripled in size overnight.
As part of that expansion they recieved the above-noted locomotives, plus cabooses and freight cars sourced from various Conrail predecessors - cabooses from EL, RDG and LV, RDG box cars, and other equipment.
In 1982 they purchased the former DL&W from Binghamton to Scranton/W-B as the grades were more favorable over their own Penn Division and it allowed elimination/consolidation of Oneonta and Binghamton yards into the former EL East Binghamton yard. IIRC trains from the north had to run around to enter the Penn Division but I could be wrong there. Conrail was trying to abandon the former DL&W at the time.
Guilford bought the D&H in 1983, and it went bankrupt in 1988. The NYS&W was made operator during the bankruptcy, Walter Rich with a lot of help from CSX. CP Rail was awarded the road by the bankruptcy court in 1992. After the Conrail split, CP made deals with NS allowing them to give up the trackage rights, particularly those to Buffalo, replaced by haulage rights.
Of the power the D&H got in 1976, the C420s were sold off as a group in 1987, most going to the Arkansas & Missouri, but at least one is with GVT.
The GP39-2s: Don't confuse those D&H bought new with the former Reading units. The D&H units Guilford transferred to the B&M before selling all to Union Pacific, of all roads. The Reading units went to CSX, I believe in repayment for the heavy use of CSX power to move D&H trains between 1988 and 1992. Some ran into the late 90s still in Reading paint. It appears CSX has retired some, others may still be in service.
The ex-LV GP38-2s, as noted 10 remain, those not in lightining stripe are in some form of CP red. Until CP repainted the 7308, it ran in a D&H blue-dip paint so weathered most of the blue was gone, revealing near complete Lehigh Valley paint underneath.