Going thru the app and building a lash-up appears to work ok. Selecting two PS3 engines one as the head and a second one as the tail with forward direction set on each. The lash-up comes up on the app and both engines will start. It will sometimes drive both engines and the train moves and other times it appears only the forward engine is driving (train doesn't move) but you can see the front engine squat.
When it finally moved it made several trips around with no problems. Stopped and it won't start moving again
Next line over is a 5 unit running just fine so I'm pretty sure I have the settings right.