Another update.
Decided one last go before I came in for the night.
Ran to the right
5 seconds later
Shuttled to the left
Over and over again
Sped it up, slowed it down all was well.
Turned controller knob to the middle (off) turned it back on and nothing.
Tried multiple times with train in different positions and no luck.
So it is all working but I don’t know the proper start up procedure to get it going again.
I thought surely I should just be able to plug it all in and switch on and it would shuttle automatically.
Could it be something as simple as the need for cleaning of the track and loco pickups/wheels? When my track and train was left uncleaned, it would sometimes stop on a poor connective spot of the track and not move unless I'd give it a little push onto a better conducting section of track.
The commutator of an electric motor (if left unclean) can also have dead spots so that the motor will not run unless the motor shaft is rotated to a position so that a clean part of the commutator is connecting. I've had electric motors which would not start unless I'd rotate the motor shaft a bit. When turning the motor off, sometimes it would stop on a good spot and be able to start again the next time, and sometimes it would stop on a dead spot, needing a little more rotation to start again. If it's not starting while on, try pushing it a little on the track, turning the wheels as you push. If the push start works, you may need to open the motor and clean the commutator(that is if the track and pickups are already clean). Failing brushes on the motor might have a similar effect?