Top 5 Longest Tunnels in the U.S.

1.) Anton Anderson Memorial Tunnel

longest tunnels in us dimly lit railway tunnel

Anchorage Daily News

Deep in the Alaska wilderness, where the Chugach Eskimos have hunted for thousands of years, cars and trains take turns traveling through the longest combined vehicle-railroad tunnel in North America.

If you happen to be going from Portage to Whittier on the Portage Glacier Highway, the 13,300-foot tunnel into which you’ll descend is the first tunnel ever designed to withstand temperatures of 40 degrees below freezing and winds of 150 miles per hour.

It is one of the few tunnels which has a combined highway-railway system. It’s completely built beneath Maynard Mountain.