Pre-CUT, ERIE passenger trains used the main tracks to the West End of the Literary St. Yard, then the connection to the Big Four's DK Tower and over to the Water St. Stn.
If you look at aerial maps, Literary St. Yard is now a builder's supply yard. The connection was under the west end of the I-90 and NKP bridges and crossed Scranton Rd. to get to the Big Four.
During the CUT construction, the W&LE also used this route as the W&LE Vinigar Hill Stn. was demolished for the CUT project.