How should automatic block signals be read?

Automatic block signals are designed to convey information to train crews regarding track conditions and movement authority. The correct way to read these signals is from top to bottom. This is consistent with the standard signaling practice where the uppermost indication provides the most critical information.

For example, if a signal displays multiple aspects, the top light will typically indicate the most restrictive aspect and should be the first to be observed by the train crew. Reading from top to bottom aligns with the visual hierarchy of the signals that train operators must interpret while approaching them, ensuring they understand warnings and instructions in the correct order. This method aids in quick comprehension, which is vital for safety and operational effectiveness on the railway.