I have no reason to believe that on a normal basis outside of detour trains, that there is any traffic not originated/terminated on NYS&W moving via NYS&W trains. As you surmised, there is no reason. It would be nice if there was a justification for CSX or NS to bridge traffic to NJ via NYSW as it would be good for NYS&W and good for us as fans (more/bigger trains), but alas there isn't justification. The entire existence of NYS&W today as anything more than a local shortline or NS/CSX branches is because of the deal that was created as part of the CR split which guarantees NYS&W can still exist but can never thrive because it is landlocked. Even before NS tanked the D&H, NYS&W was prohibited by this agreement from interchanging with CP... "paper barriers" ensured that NYS&W could support itself but could never compete with NS or CSX. All things considered, NYS&W could have been hurt a lot more without this arrangement (i.e., NS and CSX could just move all the NJ traffic to NJ themselves), but it also keeps the company's hands tied against any access to any traffic that is not internally generated or terminated by NYS&W.