rv parks along side the tracks in PA

Hi. Kenny here. I'm new to this site. Live in Albuquerque NM but from Harrisburg. Both my Grandfathers worked for the PRR. My Aunt's house was the frist house on the river side of the iron bridge at Enola. Spent many days from 1948 through the fiftys watching the action from that old bridge and now from the new one. I'm looking for rv parks/campground along the mainline, can anyone out there help? I know about the one in Duncannon, been there, a real dump but good railfan spot. We'er coming back in October in our motorhome and looking for places to over night by the tracks, even rv friendly parking lots like Walmarts along the tracks. What can you guy's tell me?
Thanks for reading this.
Kenny & Karen

The Hershey Highmeadow Campground borders the NS Harrisburg Line main, separated only by a fence. Can't get much better than that if you're a railfan!

http://www.hersheycamping.com/

Tim
Hershey, PA

Thanks Tim
I know about Hershey, failed to put that in my post. Been staying there for years, great place. Stay there when we do the Hershey Fall Meet.
Thanks again for the quick responce.
Kenny