Thanks very much, Larry! I appreciate it.
What you have is '0' gauge trains, and you may have either '027' or '0' gauge (031) track.
The transformer should have some numbers or letters on it to identify it.
What you need is a track "lockon" and hookup wire to connect the transformer to the track.
The locomotive may need a little servicing (oil and grease) to get it to run smoothly. Bring it to the hobby shop and let them do it for you.
Larry