I would like to see some discussion of experiences with coupler alignment of different 3-rail switching locomotives on curved track.
Truck-mounted couplers stay closer to the track center compared to frame-mounted, but on larger locomotives with longer wheelbase trucks, or longer cars with more end overhang, the coupler is on a longer arm that puts the coupler face further from the pivot point of the truck, which makes it diverge further from the center of the track on a curve. So the couplers won't line up as well on curves if the cars have substantially different dimensions.
Steam loco switchers typically have a front frame-mounted coupler on an arm with centering springs. They aren't going to line up for hands-off uncoupling with typical truck-mounted couplers on a sharper curve.
Body-mount couplers are my preferred standard for HO scale trains. However, 3-rail O-gauge trains need the truck-mounted couplers to better handle disproportionately sharper curves.
I'd like to hear about first-hand experiences with remote hands-off coupling and uncoupling with typical 3-rail trains, particularly ON CURVES. Do you find it reliable? Do you prefer certain locos for easier switching in this regard?
This looks like a clever work-around : https://ogrforum.com/t...-switching-assistant