My understanding (which I no longer remember where it came from) is that the NYS&W cars were of the Erie design with the ribs going horizontal,and depending on the era the Susquehanna had no cars in interchange service, but had 25 hoppers for online use only.  I can't state where they came from or how long they were in service.  I have seen the cars which I believe were made by Accurail, in the 5000 series, but don't know if they are accurate.