the available space for crossing loops is usually limited, they do not normally have an overlap (safety margin) between the starting signals and the end of the double line. In Australia, the Australian Rail Track Corporation (ARTC) policy provides for overlaps of about 500 m and 200 m respectively in an effort to avoid derailment or collision.

Automatic operation

Many crossing loops are designed to operate automatically in an unattended mode. Such loops may be track-circuited

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