I haven't had one of these for a long time, and then only briefly.
One big problem with the PFM logging 2-6-6-2 is that the drivers are 10% oversize and the whole engine was proportionately inflated.
The NWSL logging mallets had even smaller size drivers (44-45") than the 51" drivers of Weyerhaeuser #4 & #120 or the 56-57"
drivers of PFM #38,
What size(scale inches) are the drivers used by Mantua in their logging 2-6-6-2 (t) locos?
HO and Sn42