That group has a good goal, but they seem more than a little fanatical - of all the railroad fatalities I've heard about I can't ever remember one involving a photographer.  Usually it is drunken idiots or someone who tries to beat a train across an intersection.  Some of them might be trespassing, but others you could probably get legally.  They also haven't ascertained whether the tracks are still in use.  I know a place near me in Indiana which is part of the rails to trails system.  They tore out most of the tracks but left a high bridge, which you can still go to and photograph and the tracks by the bridge are intact.  Some friends of mine walked all the way across the bridge, but I chickened out after realizing that there were no railings and it was a 100-foot drop if you stopped paying attention.  I should go back this spring - with some photoshopping you could make some interesting images.

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I've shot a lot of trains over the years. Please don't under estimate the danger! Think creatively on the other side of the gate. If you're shooting video, set up the shot long before the train arrives and stand safely on the other side of the crossing gate. And give the train engineer a wave. If he honks twice its a signal that he appreciates your cautious approach.