The bok is "Shays On The Switchback: a History of the Narrow Gauge Lenora, Mount Sicker Railway", by Elwood White and David Wilke. Originally published by the British Columbia Railway Historical Society in 1963 and went though several editions. My edition is 4th and from 1973. It is about 40 pages with photos and maps and is paperback.
A very intersting line that could be modelled in real life.