If you select an End-Point of a track then the tracks are disconnected. Otherwise, the track is split at the selected point, but the two tracks remain connected. To split and disconnect at a point, split the track twice, (first splits and the second disconnects).
You cannot create a track shorter than the Minimum Track Length.
This command is useful for placing tunnel portals or Elevation Points at specific places.
Normally, you can not split a Turnout. If you hold the Shift key then you can Trim a Turnout which replaces the portion of the Turnout between the split point and the End-Point with flex-track. For Turnouts with more than one set of Turnout Points, such as a Slip Switch or Scissors Crossover, you can not select a point between the Points.
Shift-Right-Click displays a popup menu which can be used change the block gaps for the End-Point. A block gap is drawn as a thick line at the End-Point. Either or both rails can be gapped.