How are signals of the same class read when on the same post?
Top to bottom, left to right
How do you identify where different classes on the same post take you with Two Position signals?
By reading the signal diagram for that area.
What is the purpose of a Co-acting signal?
It is used to mirror a signal that cannot be easily seen due to something obstructing the view of the signal.
How can Co-acting signals be identified?
It will have the same signal number as the signal it is mirroring.
sometimes it might also have the letter P in front of the number.