The links below may help you some. Snowsheds were made of timber, steel, concrete, rock, usually anything the railroad could get hold of. Some snowsheds were over eight miles long. Some had flat roofs, others had roofs canted up to 50 degrees. Almost all had semi-solid walls to let smoke/exhaust out and light in.
Jeffrey, Thanks for the links you provided. I, for one, really enjoy looking back in history and seeing what was accomplished with what little technology they had then. Thanks, ken
If you can get hold of a copy of John Signor’s DONNER PASS, there are very detailed photos of the SP snowsheds in the book. I believe it was the most extensive use of snowsheds in America, totalling almost forty miles in the Sierra Nevada. They were built of both wood and concrete, and built in several formations, including roll-back sheds that opened the track up during the summer months.
Charles Wood’s book THE GREAT NORTHERN also has photos and diagrams of the road’s extensive snowshed system in the Washington Cascades before the construction of the final Cascade Tunnel.