New Bright 384 Holiday Express Animated Electric Train Set "attach transformer track" Questions

...other cars attached have faint lighting Check the connection from the transformer to the track, and that all the track is well connected. Make sure nothing is touching both tracks, shorting them

...attach the transformer to the track? It is on O gauge track and is transformer that came with set. Our manual is lost and this is the first time setting up the train by myself. Thank you I had the ...