What Shay O-scale locomotives (brands) are currently available (preferably 3 truck) with sound and digital control (TMCC or other)? What is the typical price range and where can they be found? I've heard of some operating difficulties with some, where the rear tender truck might tend to "push" out of sych with the front trucks. Anything to that? Do they tend to operate pretty well? I know they are really geared down and have a slow maximum speed but also a verrrry slooow minimum speed.