The full name is
Yosemite Mountain Sugar Pine Railroad. It is a tourist operation located at Fish Camp, Calif., on the south approach to Yosemite National Park. It is built upon a portion of the former right-of-way of the Madera Sugar Pine Lumber Company.
Hank Johnson wrote a book about the Madera Sugar Pine Lumber. It is entitled
Thunder in the Mountains and is currently available from Stauffer Publishing which is affiliated with the owner of the line. The same publisher has other books by Hank Johnson in print -- these were all originally published by Trans-Anglo books.
Here is the link:
Yosemite Mountain Sugar Pine Railroad
From the website:
Brian Norden