CONNAUGHT TUNNEL, piercing the Selkirk mountains at Rogers Pass, British Columbia, is a double-track railway tun nel 5 m. long. It is cut straight through Mt. Macdonald at an elevation of 9,86o feet. Construction was of the pioneer heading method which called for the driving of a separate parallel tunnel. The completed railroad tunnel has a cross-section of 23 by 29 ft. and is concrete lined. It was driven through rock and soft ground and cost about $6, 500,000. The building of the tunnel saved 552 ft. in elevation, eliminated 2,30o ft. of curvature, and shortened the route by 4.3 miles. The part of the route eliminated was largely through snowsheds and as a result the tunnel has saved annually $1oo,000 on maintenance alone.