One of my favorite 3' gauge loggers is the Sierra Nevada Wood & Lumber Co. out of Hobart Mills, CA.
They had such a diverse aray of motive power, from Shays to rod engines and then the Standard Gauge line out to Truckee.
Here is a shot of SNW&L #6 in operation in the 1920's. Many of their engines were preserved because they were kept in such imaculate condition over the years.
Martin