”This type and road is only showing up in one other scale or run.”
No doubt , this is absolutely a rare model.
"Makes this a pretty uncommon item to find. Just run it till it needs new drives. Certainly will need some weight added to pull anything. ……… As was described pretty nice drives. Just not built for longevity."
No, not really good drives at all, BUT I have run them for awhile (15 years ) now so here's what I've learned. Note you can weight these, using the factory plates, to a maximum height that is proscribed by the stack allowed over the drive frame. So following these unique "Rivarossi Rules" -
Since these are HO sized motors and have a very basic small worm-spur transmission (that you actually adjust by fiddling with the bottom gear box cover screws (as in new-good grease, find the sweet spot in the screw torque, and you get it) I limit them to pulling cars that resemble the original stock AHM cars they were sold in sets with; as in minimal (if any at all) weighting and delrin/low resistance axle trucks. Though not a scheme that lends itself to easily drill house tracks or switch yards with, otherwise they run fine in mainline (continous running) and yard lead deliveries.
Bonuses include the C-liners emitting an excellently noisy truck motor sound under load and the 0-8-0 mechanisms like yours running like a watch in either direction. I love them, but I avoid tempting fate and don't run them at club events or put them on any real length train with cars having full NMRA weight standards.
They don't compare with what most of us strive to get out of our model power, but they do have their charms.