Aug 31st - Running in the woods on tracks

You can hike, you can bike, you can even ATV....still, there's just something special about running in the woods on tracks. Sure, owning and maintaining and transporting one of these railcars can be both fun & a chore, but the running's the real joy.

Click the short flash-movie link on the right; it'll open in a separate small web-page and you can see what this is about.
Encountering these while hiking in the woods can be a surprise, but then, hikers always stop-look-listen when crossing tracks, don't they?? shouldn't they??
So where are these tracks in the woods?
Miles & miles of 'em in NH.