From Hershey your best bet is to take Interstate 81 North - the directions you get from Yahoo driving directions will work well. I hope you don't expect to see much - there isn't much left in Centralia. Most of the town is overgrown with bush. You can't actually see the mine fire up close. In nearby Ashland is the Pioneer Tunnel Coal Mine which gives you a tour of a non-working coal mine - the web site is http://www.pioneertunnel.com/home.shtml
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