God bless ya! I moved to E-taaahn (PA Dutch pronunciation) in 1975, and my last PA address was Palmyra, when I left in '08. You have a very easy and pleasant drive to the local railfan hot spot which is in Hershey at the Derry Road crossing - plug this into Google Earth and it should take you to the spot:
40.292203, -76.645866
Just head up 743 to Hershey, turn right on E. Chocolate Avenue, turn left on Mansion Road and left, again, on Derry Road. The parking lot is on the southeast corner of the intersection of Derry Road and the railroad. There are folks hanging around there most evenings and both the Derry Township Police and the NS Bulls are OK with all this provided that everyone behaves responsibly. Hershey is not a town, as such, but only a post office in Derry Township. You'll learn all this and other folkways in short order. I can put you in touch with some local droolers if you'd like - just email me.
Harrisburg is a tangle and you won't see fast freights because they must use an old interchange connection between the Reading's Lebanon Valley (Lepnin Walley) and the PRR which was never intended for speed. However, old Harris Tower has been acquired by NRHS, has been restored and is a great place to watch both AMTK and NS ops in the company of kindred spirits - when its open:
http://harristower.org/
I have fond memories of the Broadway flying westbound through E-town behind GG1s and smelling the ozone, the fumes from the charcoal range and what was cooking for dinner in the diner. Enjoy!