This command is used exclusively with Sectional Track.
Occasionally pieces of sectional track do not line up exactly, especially when creating figure-8's or passing sidings. When laying out the actual track you can compensate for this by adjusting the individual tracks to provide a bit of slack. This command simulates that process.
Click on the endpoint of each track you're trying to connect. Tracks will move slightly in an attempt to overcome the gap. If the gap is too large, the connection will fail. If this occurs, try using other track pieces in your layout.
XTrkCad adjusts the positions of tracks connected to the tracks up to a track with more than two connections. See the Demo for details.
If one (or both) the selected tracks is an adjustable section (such as Kato's Adjustable Track #20-050) then the length of the track is changed to fill the gap.
You can undo the effect of the Connect command by splitting (Section 2.2.15.1) the track to disconnect it then using the Shift+Left-Click Connect command on the unconnected endpoints to tighten connections between the tracks.