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This type of join does not work for Bezier or Cornu tracks, use Cornu Easements (Section 2.2.7.4) for these tracks instead.
After the first track is selected, an entry field for prefered radius will be shown. A non-zero value will enable the snap anchor for the join radius.
If the track appears in black (and you are happy with the curve as its drawn), release the mouse button.
If the radius snap-anchor is active, and the position of the cursor is close to a position where the Join is exactly the desired radius, a blue circle will be shown. Releasing the button while it shows will snap the Join to the desired radius. If Easements are enabled as well, this fixed radius Join track will be joined to by easements.
Throughout the above, the exact shape of the curve can be adjust by dragging the mouse around while keeping the left mouse button held down.
Sometimes, no matter where you drag the mouse, the curve stays red and the tracks cannot be connected. This means the resulting curve is tighter than the minimum track radius set in the Preferences dialog (Section 2.10.7). If desired, this setting can be adjusted from the Preferences dialog using the Options>Preferences menu selection to raise the dialog. If changing the minimum track radius is not a desired option then it will be necessary to relocate one of the tracks that you're attempting to join.
You may also find that XTrackCAD will not create the connecting curve in the exact shape you want. If this happens it may be necessary to either move one of the end points or draw a partial curve (or straight) and try again.
If enabled, Easements (Section 2.10.4) will be automatically generated between tracks of differing radii. When using easements, there is a minimum radius as specified in the Easement dialog. It's not possible to join tracks with less then this radius and the connecting track's radius must be greater than the minimum radius.
If any errors occur while joining tracks (such as moving beyond the end of a track or using a curve with a radius smaller than the Easement radius), then the joint track will be drawn in Red (The default colour of Exception Track errors. See Section 2.10.1 for detail). This colouring serves as visual indication for a connecting track that doesn't meet minimum specified parameters (Section 2.10.7).
Any tracks created during the Join command will have the following properties inherited from the first track: selected state, hidden state, scale, track gauge and Layer.
A join can be made to or from a circle (Section 2.1.1) of track. Joining a track with a circle will cause the circle to be converted into a curved track.
For detail about;