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With the addition of the P4 Passing Siding, a new 30 degree crossing was installed between the 3rd Line and Main Line, a potential point of conflict. A 2 arm semaphore signal was installed south of the crossing to provide protection for that area. If turnout P4 is switched, the signal will read red, stopping 3rd Line activity to allow the Main Line traffic across the intersection. If the P4 turnout of normal, the signal will read green, allowing for normal operations on both lines.