See Spiral Tunnels, Yoho National Park, Canada

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The first stop on the drive through Yoho National Park from Banff National Park is the Spiral Tunnels. These are two tunnels that make a gigantic loop inside the mountain to allow the trains to make a more gradual decent/accent of the "Big Hill". The spiral tunnels were necessary to decrease the slope of the track, as it made its way up to Kicking Horse Pass. There are two viewpoints where you can safely watch trains and learn more about the Spiral Tunnels and Kicking Horse Pass National Historic Site of Canada. On average, 25 to 30 trains pass through the Spiral Tunnels daily, though not on a regular schedule. From the viewpoint 7.4 km east of Field on the Trans-Canada Highway, you can see the Lower Spiral Tunnel in Mt. Ogden. The Upper Spiral Tunnel in Cathedral Mountain can be seen from the pull-off 2.3 km up the Yoho Valley Road. An eastbound train leaving Field climbs a moderate hill, goes through two short, straight tunnels on Mt. Stephen, under the Trans-Canada Highway, across the Kicking Horse River and into the Lower Spiral Tunnel in Mt. Ogden. It spirals to the left up inside the mountain for 891-m and emerges 15-m higher. The train then crosses back over the Kicking Horse River, under the highway a second time and into the 991-m tunnel in Cathedral Mountain. The train spirals to the right, emerging 17-m higher and continues to the top of Kicking Horse Pass.

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