Is there a lock on to fit fast trac
Look under any long piece of track. There is a center rail terminal and outside rail terminal. .110 female quick disconnect terminals fit.
The 6-12016 terminal track is only different because it has a small opening in the roadbed for the wire.
I am not certain about the wire size of the new Plug'n'Play lock ons. Call Lionel and ask about their recommendation for track power use.