Grafton, WV is where I usually go. Be careful on state route 119 though--I've seen several accidents down that way, and the state police does patrol the road. Once in Grafton, there's an alley that parallels the yard, so it's easy to watch locomotives getting refueled. Two main bridges with walkways allow you to see what's coming and going. If you're leaving Grafton, taking one of the side roads (towards the river) allows you to drive alongside the yard. Further down, a single-lane bridge goes over the yard. Trackside, you can pull into the dirt lot to watch trains.
If you're up for a challenge, head over to Rowelsburg (I hope I spelled that right) towards M&K Junction. I didn't see anything moving over that way, but the position-light signals were still in place last year. Oh, and there's a general-store along the way with an interesting museum/scrapyard of steam locomotives and other assorted machinery.
If I'm not in the mood to head to Grafton, Waynesburg, PA is next. Quite a few coal drags on the former Monongahela RR lines. Quite a few places in and around town to watch trains. However, further out most of the surrounding land is posted. Get permission before entering! One more thing, the last surviving Waynesburg & Washington steam locomotive is preserved at the county museum just off state route 21.
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