Hello Roger,

Some things to try, I have found because the ECos is multiprotocol and so are the loco's they can get confused as to what they are receiving and what to do. For example a loco that crawls ignoring the controller because it decided it was on DC. Try telling the loco to respond to a single protocol and then the Ecos to output that protocol only. Then play with putting extra data on the track and see if all stays well. It was the Marklin multiprotocol decoders I've known to get confused and need to be told what to respond to. I believe KM1 use ESU loksound decoders so again they they can be set for all or some protocols and even to do some functions when running on DC or AC. Especially if the locos are secondhand and been tweaked. I would put only DCC or M4 on the track and set the locos to ignore AC and DC as a starting point. Having all 3 running at once with smoke and sound will use a fair bit of power but the Ecos can tell you how much is being drawn to see if that is an issue. If you have the Ecos power supply check it is set to a sensible voltage, 16-18 seems good for gauge 1.

Graham