当相应的装置运行时，如果信号器面板TRANSIT灯不亮，则认为该灯不工作。

A If an annunciator panel TRANSIT light fails to illuminate while the corresponding device is in motion, then this light must be considered inoperative.

B When related device is in operation and if annunciator panel TRANSIT light comes on so this light does not work.

CThe light is considered to be available if the annunciator panel TRANSIT light goes off when the related device is in motion.