The D&H interchange was quite substantial in Port Morris Yard. Also, it served locals from Philipsburg and east on the Boonton Line as well as runs as far east as Summit (picking up and dropping off some to and from the Gladstone Branch). And, I imagine one or two cars for the Rahway Valley. A local often came east to Summit to serve this purpose. Several times I saw a D&H engine doing this as late as the late 1950s. That local came in to Summit at around 9:30pm and left about an hour later in return direction.
Back to Port Morris, most all the mainline symbol freights stopped there between Hoboken and Buffalo. Westbound schedules showed the following in 1956:
HB-1, arrived 9:00pm, depart 9:20pm
HB-3, stop at 11:00pm
2/HB-3, arrive 12:25am, depart 12:55am
HB-5, arrive 1:30am, depart 2:00am
HB-7, arrive 7:15am, depart 7:45
HB-9, originate there at 11:40 am (following #3 Phoebe Snow which went through Port Morris Junction at 11:44)
I always wondered why the night passenger train, #15 Owl, went up the M&E (not making any stops). The only thing I could figure was that HB-5 left Hoboken at 11:45 and used the Boonton Line thereby it would have slowed #15 which left Hoboken at 1:01am passing Port Morris Junction at 2:08am. HB-5 left Port Morris at 2:00am; it passed Stroudsburg at 3:00am. The Owl must have followed HB-5. But, #15 stopped at Stroudsburg in 44 minutes at 2:52. Somewhere west of Stroudsburg, #15 overtook HB-5, because #15 arrived Scranton at 4:20 and HB-5 arrived at 5:15. HB-5 probably used helpers up the hill west of Stroudsburg.
"Passing points, New Jersey Cut-off Eastward freight trains, being handled by two engines, when clearing at Blairstown and Greendell, may hold main track and put first class or other trains through sidings."
DL&W ETT, No. 84. Nov. 8, 1942