The Join Track command is used to bring together and connect any two segments of track. During the join process, XTrackCAD ensures the connecting tracks are properly aligned.

See Help>Demo (Demo Mode) for examples of how to join tracks.

For detail about;

Using complex curves if Easement is set to Cornu Join with Cornu Easement.
Using Normal Easements where tracks are either joined with a straight or a 'simple curve' Join with Normal Easement, e.g. one which uses a curve in a single direction as opposed to using a S-Curve (XTrackCAD Terms)
Using straight flex-track to join track segments refer to Using Straight Flex-Track.
Moving one segment of track to join with another refer to By Moving Track.