A pioneer tunnel is a specialized method of tunnelling into a solid body by starting one tunnel on one end and another tunnel on the other and then meeting up in the middle. This method speeds up the completion of the finished tunnel significantly. A notable example of a pioneer tunnel being used in practice is the Connaught Tunnel which was dug through the Selkirk Mountains of British Columbia, Canada and completed in 1916 for the Canadian Pacific Railway. The Connaught Tunnel is 8 kilometers i...
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