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I'm not sure where you'll be at lunchtime. I only know the latter part of your route, but one possibility if you get that far by lunchtime is the Middlesex Diner in Carlisle, PA. They have a large selection, good food, and fast service. If you get even farther, I really like the Schmankerl Stube, a German restaurant, in Hagerstown. (I'm assuming you mean Front Royal -- no "e" -- Virginia as your destination. I don't know of a Front Royale in PA.)