Be aware that a lot of content is hosted off the DLS, so if something is missing, that's probably why. You can tell what, if anything, is missing, by going into Content Manager, right-clicking on the route or session, and checking Dependencies. Anything with a question mark is almost certainly hosted off the DLS. A lot of NEC and NJT stuff can be found on Trainz Commuter Rail and Trainz Pro Routes, including a Conrail/NJT route.