I am looking for some of the old timers to tell what they may have recollection of when automatic train control came into being and when they first got the crossing lights. My grandfather was an inventor, and got his inventions patented. His name was George W. Gerlach. The inventions pertained to automatic train control. There was a patent infringement suit in the 1930's. He also invented/had patented (1,191,414) Safety Block Signal, and (1,135,574) Block Signal Control Safety Appliance for Locomotives. I am looking for any individuals who may be familiar with what he invented, who may have knowledge of this suit, and who would be willing to correspond about automatic train control history being made related to the railroad.