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The passage of a law requiring the adoption of a block-signal system has been proposed to the Congress.
Give this boy and girl of yours a few good books and you're starting them on the double-track, block-signal line to happiness.
Why should he battle with the intricacies of a block-signal system when everybody else round the place has a separate bell?
A goggle-eyed toad stared impudently at him from a long tangle of rubbish that had been a train -- stalled there forever by the final block-signal of death.
a block-signal system has been proposed to the Congress.