Tom,
Shay, Climax and Heisler 3ft narrow gauge geared locomotives and logging locomotives in general were my main interest for many years. Live steam Shays are incredible pieces of kit. Their unique motion parts are hypnotic.
Youtube has some nice footage showing a couple of 2-1/2" scale live steam model Shays being prepped and running on the Train Mountain live steamer line in Oregon. Preserved No's 14 & 15 from the Westside Lumber Co. are impressive machines both full size and in 2-1/2" scale.
Just search Youtube for 2-1/2" scale live steam Westside Shays 14 & 15 at Train Mountain. (I can't do links, but I'm betting someone will step up).
Mightily impressive what some model train guys churn out in their spare time. VERY deep pockets needed for one of these beauties if you don't have the machining nous to self build. My pal in Brattleboro, VT builds 2-1/2" scale one-off Westside Lumber Co. rolling stock for these guys to haul behind their Shays. Built from prototype plans and complete down to the last nut and bolt. The WLCo tank car and caboose were in his shop last time I visited.