Central Artery Tunnel

The Central Artery Tunnel is a large railroad tunnel which carries RER lines A and B from Newisle Union Station to Cliffcrest and Fallout Bay. It travels underneath the entire length of the city near bedrock levels and meets the Highway A1 bridge where it brings rail traffic over the Columbia River. When it was completed it was the largest and most expensive public works project in the United States since The Big Dig in Boston.