How It Started … How It’s Going
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What phrase for official permission comes from railway signaling? A white lamp originally meant 'clear,' but fallen or vandalized red lenses kept turning stop signals into false all-clears. In 1876, Britain's Great Northern Railway switched 'clear' to the color it still is today. (Two words: 5, 5 letters)
Ten clues, one 10-letter answer built one row at a time. Play today’s Origins Quiz.
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