description Spiral Tunnels Overview
The Spiral Tunnels are a pair of railway loops located in Yoho National Park, British Columbia, Canada, on the Canadian Pacific Railway line. Completed in 1909, the tunnels were engineered to reduce the steep and dangerous gradient of the Kicking Horse Pass from approximately 4.5% to a much safer 2.2%. This design allows lengthy freight trains to cross the valley by passing under and over their own track, effectively gaining elevation over a short horizontal distance. They remain a critical piece of North American rail infrastructure and a historic landmark.
help Spiral Tunnels FAQ
Where exactly are the Spiral Tunnels located?
The Spiral Tunnels are a pair of railway loops located in Yoho National Park in British Columbia, Canada. They are situated on the main line of the Canadian Pacific Railway. The specific location is the steep Kicking Horse Pass in the Canadian Rockies.
Why were the Spiral Tunnels built?
They were completed in 1909 to drastically reduce the steep and dangerous gradient of the Kicking Horse Pass route. Prior to the tunnels, trains had to navigate a deadly 4.5% grade known as the "Big Hill." The spiral design allowed the trains to gain elevation more gradually by crossing over themselves.
Can tourists see the Spiral Tunnels?
Yes, there are designated viewing areas off the Trans-Canada Highway where tourists can safely watch the trains. Informational plaques at these points explain the history and engineering of the 1909 loops. It is one of the most popular historical stops for visitors in Yoho National Park.
How many Spiral Tunnels are there on the Canadian Pacific Railway?
There is a pair of tunnels, known simply as the Spiral Tunnels, completed by the Canadian Pacific Railway in 1909. One is called the Upper Spiral Tunnel and the other is the Lower Spiral Tunnel. Because of the unique figure-eight design, trains passing through the loops can sometimes be seen from both ends simultaneously.
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