In my case I loader the steamer first, the BB1 was still in its box.
The steam engine loaded correctly and ran fine.
I completely shutdown all portions of the system.
An hour later I came back, unpacked the BB1, placed it on the track and powered up everything.
I then did a search to Load the new engine. It appeared to load correctly. I then started the BB1 and the steamer also started. Both moved forward when the thumb wheel was advanced.
I tried numerous variations to correct the problem. Delete and reload, doing so for both engines.
Finally, I just ran one at a time, while the other sat on the workbench. Both engines ran fine by themselves, with the exception of the BB1 backup headlight.
