I use Fastrack, with feeders dropped from the little underside connects (spade, clip?) for each track segment, except the turnouts. That's usually where the train dies too. However, while it's running, when it does run, the lights flicker a LOT and it may just shut down randomly anywhere on the layout. I don't think this is a current issue, but a voltage issue. Hence the willingness to try the DB210, that might be a good choice. Higher voltage, with more current, and better connectors for this setup. Ordered that from Amazon just now. I have an 18V 5 amp hobby transformer to power it. I'm also upgrading my terminal blocks, what I'm using now are small for 12 awg, and I'm going to beef up the bus to feeder connections, probably soldering them. I'm also going to clean the track extensively before the next test.
I'm not totally convinced it's not the MTH trolley. We got the Christmas trolley a few years ago, and it didn't run well with the DCS setup, same issues. At the time, I chose to switch to DCC because I knew more about it, and because the DCS app limited what you could do with their cheaper wifi explorer. Since I cut the cord, I see they allow you to upgrade the app to get the missing sounds/capabilities. C'est la vie. I did order a new Christmas engine and a few cars from MTH from their 2020 catalog, but that doesn't come for a while, so I have to wait. I'm going to see if I can find a used PS3 engine on EBay for cheap enough to use for comparison and testing. I'm also going to rebuild my little 036 circle as a small test track for experimentation.
**Edit**
It's the 52 Zephyr.
