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A Phantom Overlap (POL) is one which ends in the middle of a Track Circuit generally before a set of points within that Track Circuit.

It allows the necessary safety margin without needing to interlock all the points.

The route lights only extend to the ROL marker.

This picture shows a Reduced Overlap (ROL) too.

:usertrack:glossary:pol.png

Last edited by GeoffM on 15/09/2016 at 03:00