What Track are you using?
One wire for legacy in some track.
Two wires in other track.
Meaning after it goes to all channels on DCS output and to the terminal block, the wire to the electric district common hooks up to both out side rails on Ross, Gargraves, atlas track.
You need the common Black wire on both outside rails as the Legacy uses both outside rails to give the correct command control signal broadcast. Fast track, MTH track and Lionel tin track have the outside rails in each track connected in each track. You need to connect both outside rails together in all power districts as we have gargraves track that has no ties of the outside rails.
Lionel tech video
http://www.lionel.com/customer....cfm?documentid=6355
The drawing shows the both outside rails are needed to boardcast legacy and the train drives thru the signal 2 inchs off the track.
Barry's book and surrport is well worth the cost even at 50.00.
**** we all be lost with out Barry.
BUY THE BOOK instead of aspirin they cost about the same.