I've got a set that I found through Facebook marketplace, one that Walthers made as a promo for Raybestos brakes (came with a really nice kit of a 1940's-1950's style service station.)
The cars are nicely made, good and solid feel. The loco reminds me of the 1980's Athearn engines, with the nice and heavy die cast chassis, good runner with a nice amount of pulling power.
At some point I'll look for some more used Trainline engines or sets, because the one I have is really nice.