Yep. It was the spring contacts. May add a pot in the cars to dim the lights. Looked better with less light when I ran with an old engine on analog.. and not always at 18-20v as with dcs...
Idk on the track... the cars on 54 have more overhang then I like... only stands out to me....I'm going to get some garages o72 curve sections from Mario's as 3 pc make a 90 degree turn. Ross also has sectional, but requires 4pc for a 90.
Maybe I'm wrong on car length... but when I was at store in Indiana, the Lionel SP cars length was 2" longer comared to mth.. and stated minimal o54 as mth say the smaller radius.. I think o42?
Even I will go and look to see.