Sean O'Connor

Pushed to his breaking point, a master welder in a small town at the foot of the Rocky Mountains quietly fortifies a bulldozer with 30 tons of concrete and steel and seeks to destroy those he believes have wronged him.

Somewhere in the world right now--much closer than you think--people are playing with trains. You might not see them at first, but they're there. In basements. In garages. In converted Army barracks. They're among the world's most compelling underground communities.