First you technically cant cross a RR anywhere. You are on their right of way and eveen though you own or have right s to the property still means your tresspassing if you just cross it on a not legit crossing.
The other is The guy in VT, you dont post your land but are ok with people just tresspassing and hunting your land? If i read what you wrote right, here with out permission you are still tresspassing on property if you hunt it and dont have permission to hunt it, regardless of signage.
Sandman here in SC you can not be landlocked you have to be allowed access to your property, it may take legal action but you cant not be allowed access, this may mean haveing to purchase a ROW from an unwilling owner via court ruling but still they have to let you in.