Danger signal
"Danger signal" in a Sentence (1 examples)
2005, "Practical Railway Engineering" by Clifford F. Bonnett, Imperial College Press →ISBN https://books.google.no/books?id=qcMgBJ1exfIC&pg=PA137&lpg=PA137&dq=%22at+a+danger+signal%22&source=bl&ots=c4Rl2aryKd&sig=vhZYJY8AkP63OAbCws6GS9882q4&hl=no&sa=X&ved=0ahUKEwjg2OSL19PZAhXJJMAKHQxdA2sQ6AEILzAB#v=onepage&q=%22at%20a%20danger%20signal%22&f=false On a train travelling at say 40 miles per hour a driver would have to react quite quickly to bring his train to a halt at a danger signal even if he could see that signal half a mile away.