The Split command can be used to add block gaps (XTrackCAD Terms) at the point where two track endpoints join. Block gaps are drawn as a thick line and can be placed in either of the rails or both if total isolation is required.

No Block Gaps

Block Gap in top rail

Block Gap in bottom rail

Block Gaps in both rails

After starting the Split command use the Shift+Right-Click over a joint (with the blue "X" anchor showing) to display one of two pop-up menus which can be used to add, change or remove block gaps for the selected endpoint.

This menu appears if track runs in a horizontal direction.

This menu appears if track runs in a vertical direction.

For detail about;

Disconnecting the joint between two sections of track see Disconnect Joint.
Dividing a section of track into two connected pieces see Divide Track.