The History of Signaling and Safety in the United States

Before 1946, signaling and safety before 1946 was a half hazard array of railroad specific signaling and stopping ways. So you had search lights. You had seven fours. You had sometimes you had derails like we saw in the news article to protect sightings and other things from overruns. Sometimes they had to install a switch that immediately go into went into the ballast for that on certain when the operations you see that a lot in Japan.