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Reference.org
Railway signal
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<p>A railway signal is a visual display device that conveys instructions or provides warning of instructions regarding the driver's authority to proceed. The driver interprets the signal's indication and acts accordingly. Typically, a signal might inform the <a href="/facts/Train_driver/P0IjXLTu">driver</a> of the speed at which the train may safely proceed or it may instruct the driver to stop. </p>