Spiral Tunnels
The Kicking Horse Pass is one of the steepest terrains in North America for a railway, which posed a real problem for the engineers who were tasked with punching a railway line through it. To solve the problem of numerous runaway trains and crashes, two circular tunnels were driven into the valley walls of Cathedral Mountain and Mt. Ogden to reduce the 4.4% grade to a safer and more normal 2.2%. The viewing platform at Lower Spiral Tunnel lookout is one of the best places to watch passing freight trains (25-30 trains pass through daily) going in and out of the tunnels, and there are several interpretive panels explaining the facts and history of building the railway through the Canadian Rocky Mountains.
