Thought I understood a little about prototype signals, but noticed something odd recently. I'm still using default USA or USA2 signals, on a facing point switch I usually stick a double head USA2 02 (or L if it's a left diverge). Through route set, clear all the way to Ecuador, got green over red. Throw switch curved, diverge route is clear all the way to Morocco (aside from the occasional fishing boat off the Azores), got red over green. Problem comes in when a route is not clear all the way - I would expect yellow over red for straight, red over yellow for diverge, but instead I'm getting yellow over green for either route. Makes it impossible to tell which way the switch is thrown, anyone know what prototype practice on double heads at facing point switches is for something like BNSF?