Hi, I am currently familiarizing myself with this site. Please bear with me.  In answer to Desertdweller reply, the over length of track involved is 48 linear feet.  It is flat and I do not, presently, intend to run anything other than the train.  The passenger cars are lighted.  I did some research and I believe I need to utilize one or more busses, but I haven't located any info on the net that explains the wiring.  Help.

Thanks,

Stan

I am relatively new to model railroading.  I am building a new layout and the outermost track on my O gauge layout is 180 inches long and 88 inches wide.  What type of transformer will I need to power a 3 passenger car and a steam 2-8-4 around the entire outer track?