I haven’t decided yet how to do signaling. Dean Park had a video recently where Dave described a simple setup for signaling on a mainline using Heathcote Electronics components. The signal aspects (the devices used to display the state of the signal) may not match the Union Pacific in 1960 but what exactly was used I am still researching. The results of that will be on this page also.
Union Pacific Signaling in the early 1960s