RE: Hunting Railroads. Back in the early 70s, my college days, we used to hunt RR track right of ways all the time without a thought about trespass. Seems like it used to be legal o hunt back then. Maybe not though; I'm old enough to have CRS disease.
Did the law change or was it always trespassing?
RE: Wardens. I've run into two basic types. First, the "normal guy"; basically a friendly approach. He's doing his job, checking the basics (license, steel shot if necessary, etc.) Will chat with you, tell you which WIHA seem to be producing birds, etc. Second, the PITA Warden. The moment he sees you he is sure you are guilty of SOMETHING if he just digs deep enough. Not friendly, just wants to be able to ticket you.
I've met more of the first type in SD. More of the second type in KS, CO and GA. YMMV.