Tommy posted:The term is used in a 1928 film of a ride in the cab of a New York Central locomotive. The engineer repeats the signal provided by the fireman and adds the word "forestall" after each signal is called.
There is an old NYC-produced information film called "The Railroad Signal" that mentions the term "forestall" in the context of an engineer acknowledging a wayside signal that is not green on a high speed train with the train control safety equipment used in the 1940s. You can see this on Youtube. Go to about 8 minutes into the video and you will see the term used.
https://www.youtube.com/watch?v=ygt3ktpmQyE
Scott Griggs
Louisville, KY