MNRR "Budget" Wayside Aspect Chart:
*G* = Proceed Cab
R/R = Stop
*R*/*G*/*R* = Absolute Block
There are also these which I don't know the real names of. Again to save money these are displayed on a RYG traffic light dwarf stack:
R/G = Terminal Clear / Slow Clear
R/*Y* = Terminal Approach / Slow Approach
R/Y = Restricting
I also see the flashing yellow on dwarf H-5's at SS34 (STAM) but not sure what they mean.
One quasi exception is the hybrid setup at CP-75 where you have NYC signals leading out and MNRR signals heading in. I will say that MNRR maintains the old NYC gantry to a very high standard. Shame they junked all their other legitimate signals.
http://acm.jhu.edu/~sthurmovik/Railpics ... dwarfs.jpg
http://acm.jhu.edu/~sthurmovik/Railpics ... gantry.jpg