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Page:Popular Science Monthly Volume 89.djvu/567

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TuniieJiii.o- Throufrh the Canadian Rockies

��One of the inter- sections of the pioneer tunnel with the main tunnel. Horses were used to haul the muck cars to the point where they were dumped into railroad cars. From this point to the mouth of the tunnel standard-gage compressed -air locomotives were employed

A view of the entrance to the tunnel under Mount McDon- ald. It emerges at a point in the Bear Valley about one thou- sand feet be- low the present railroad route

���In the lower picture the mountain is shown sliced away to reveal the pio- neer and main tunnels, as well as the laterals connecting the two. The ma tenal excavated was hauled through the pioneer tunnel and then through the main tunnel as indicated by the arrows in the diagram on the right

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