I bought a 30-7915 depressed center searchlight car at a train show over the weekend, and after a thorough cleaning, the searchlight still flickers a lot.
Eyeballing things while holding the car upside down in one hand and running a piece of straight track over the wheels with my other hand, it quickly became apparent that the center roller was not making good contact - I could even see an air gap between the roller and center rail at times. The roller has unrestricted freedom of movement and is fully seated in the full downward position when not on the track. But even just holding it in my hand and eyeballing things, it's pretty clear the roller is about even with the tread on the wheels - both trucks are the same.
So in general, is this truck with the little narrow diameter contact roller known for this issue? Or am I just overlooking something?