The longest road-going vehicle in the world heads into dangerous territory to bring electricity to an isolated region, a tunneling behemoth dares to dig a new subway system under a bustling historic city and a sleek new vessel fights the war on narcotics.

The world's most powerful backhoe dredger digs up New York Harbor to clear the way for bigger cargo ships, a revolutionary new firetruck protects an international airport, and a mobile factory rushes against the clock to rebuild a railroad.