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Purpose

Sometimes it is necessary to keep a level crossing closed indefinitely. The DET button is used to close and keep closed a crossing, while the DELT button allows the level crossing to open again.

Level Crossing Keep Closed Button (on the left)

Operation

To keep a level crossing closed press the DET button together with the main button of the level crossing. Notice that both the DET and the DELT button have a yellow dot on them - this indicates that the buttons only work when a level crossing main button is pressed. A main level crossing button is yellow while a secondary level crossing button is grey.