Sissy,
I came across this Lionel video of 2 Lion Chief controlled locomotives being operated on the same track.
From the information I can gather, the Lion Chief controlled locomotive will work with any transformer attached to the track, but the transformer must be turned up to 18V/full throttle and the locomotive controlled by the matching Lion Chief transmitter. A conventional locomotive attempting to operate on the track at the same time as the Lion Chief controlled locomotive would quickly attain Warp Speed.
Happy Rails!
Dave