well..the "Route of the Phoebe Snow" only went as far as Buffalo..not Chicago.
The Erie and the Erie Lackawanna both went to Chicago, but not the DL&W..
very little of the Lackawanna is still in place in NY state..the Erie routes fared much better than the Lackawanna after 1960.
im not sure how much of the DL&W is still in use between NEw York City and Scranton..but I can give you the entire current status between Scranton and Buffalo for the DL&W mainline:
From Scranton PA up to Binghamton NY the DL&W is mostly in place and in use..by D&H/CP.
From Binghamton west to Gang Mills (Corning area) the DL&W rails are all gone..mostly cleared away for the construction of route 17 in the late 60's/early 70's
even the ROW is wiped out in most places..
From Gang Mills to Wayland the DL&W is in use by the Bath & Hammondsport railroad. (under control of the Livonia, Avon & Lakeville)
then tracks torn up between Wayland and Groveland station yard.
no rails over Dansville hill.
Rails are in place, but not currently in use, between Groveland and Mount Morris..this is now the Dansville & Mount Morris RR (operated by G&W)
then a short stretch in use by the Genesee & Wyoming between Mount Morris and Greigsville.
no rails between Greigsville and Depew.
a short mile or so in use around Depew..
then torn up straight through to Buffalo...the DL&W is mostly dead in NY.
it survives in small seperated chunks..never to be a complete railroad again.
(and all these bits are now single-tracked)
The Erie lines fared much better in NY..much of the Erie is still in use all the way acoss the entire state. its the "Southern Tier Main"..in use by Susquehanna, NS, and WNY&P.