There exists a GTFS schedule viewer which makes it much easier to interpret the feed.
https://googletransitdatafeed.googlecode.com/files/transitfeed-windows-binary-1.2.12.zip
Download, extract, drag and drop the GTFS zip on schedule_viewer.exe, ignore the warnings, go to localhost:8765 in your browser when it says so. Note: the calendar doesn't work, enter a date in yyyymmdd form.
Comparing train numbers is tricky when it comes to certain situations, especially Huntington/Port Jeff connections since only the number of the easternmost leg is listed.