This is a NJ Transit Signal Guide.
When I was a kid, I used to ride on the NJ Transit Raritan Valley Line every week. An engineer gave me an official NJ Transit Signal Guide which explains all the signals on the railroad and what they mean. He also gave me a tour of the inside of a GP40FH-2B and when he found out I was making a replica of this line on my train simulator, he gave me an official track schematic (which I unfortunately lost in the move). In this video, I'll also tell a funny story of how I unintentionally caused the passengers to worry when I accidentally called out a "stop and proceed" signal as a "stop" signal.