The Anton Anderson Memorial Tunnel, which connects Portage to Whittier, is designed for temperatures down to 40 below, 150 mph winds, avalanches, and fires.
At 2 1/2 miles, it’s the longest highway tunnel in North America, just one lane that is shared by vehicles and rail PORTAGE , Alaska -
Trains and about 250,000 cars, trucks, boats, and more make their way through the mountain every year. It’s an organized dance, using a lot of technology housed in the tunnel control center. This tunnel is the first in the world to use computerized regulation of both rail and highway traffic. It’s also the first U.S. tunnel with jet turbine and portal fan ventilation, all hidden in the A-frame structure.“The thing about a fire in a tunnel, it’s not a matter of if — it’s a matter of when,” Burton said. “The engineers’ goal was to make one of the safest tunnels in the world.”
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