GP 7 #556, # 561 hauling empty box & autoracks to Chrysler Plant across the Meramec River at Valley Park.
Terminal RR. Picking up loaded box & autoracks at Lindenwood yard and headiing eastbound to Chouteau yard.
I can't begin to imagine how much work and how long it's taken you to get your layout to the overall stage it's at! I bow to your greatness!
In the Frisco In Color book by Louis Marre & Gregg Sommers on page 112 there is a photo ( below) that shows the dwarf signal and the searchlight signal above the cab of the second locomotive. There is also another photo on page 100.