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Signals are imperative for safe operation of multiple trains on the same line. They divide sections of track into "blocks", and operate according to train movement, protecting occupied tracks and the trains on them. If the track protected by a set of block signals is occupied, they change to red and stop any other trains from entering until the block is clear.
要讓同一路線上的多輛列車能安全運轉就必須仰賴號誌機。它們會將軌道分成「閉塞區間」再根據列車的位置進行指示,藉此保護被佔用的軌道和列車。如果某一區間的軌道被佔用,號誌機會顯示紅燈並禁止其他列車進入,直到該區間已淨空。