Mark; It is true that the 2-6-0 wheel arrangement locomotives were often used, but Most small logging operations, if they were looking for rod type motive power, would be looking for locomotives with pony or trailing trucks. The reason for the leading (Pony) trucks and the trailing trucks, was to better lead the drivers into curves and other track configurations. Often the “Cheapo” loggers didn’t want to spend money on turning facilities, so the Moguls were then forced to run in reverse without the trailing truck. More popular were the 2-6-2 locomotives, and even 2-8-2’s…but the smaller operations stayed with “Critters” like 0-4-0’s and anything you can imagine…
From what I have seen, on the bigger shows, the rod locomotives were used more for the long hauls on the main stem, while the temporary trackage was blessed with the “Critters”.
Then of course we get into the geared locomotives, that were slower, but could negotiate just about the worst of trackage’
I realize, I gave you more suggestions than you asked for, and I’m NOT an expert on the logging railroads, but there is lots of history out there through Google, that can give you ideas and facts. Others will jump in and help, I’m sure.
Fred Mills