I find as time goes on, I try to find new locations that are harder and harder to get to. Last year's new spot for me was at MP 290, which every time I ride the train, I said to myself "I've got to get to this place"! So I would bet you that when you ride you're going to say that to yourself about 500 times in the 64 miles.
So take the advice of others posted here, and do the best you can this trip. Get everything you can! But make sure you start planning the next trip on your way home.
Even after 25 years you'll be finding new spots.
Bill Kepner