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10-5
SIG-00-22-02 JUNE 2022 (Revised September 2022)
Version : B.1
Figure 10-3 Advance Preemption
10.1.2.2.1
Second Train Logic Used
When Second Train Logic Used is set to Yes, this is used to prevent the crossing recovering
when one train leaves the island and if a second train is approaching on a second track and has
not caused activation yet. There are two reasons for this a) advance preemption is used, and
the advance preemption timer has not expired for the second train, or b) the PSO has a drop
delay and the drop delay has not expired.