Hey guys. I am a new route builder, and would like to know what different kinds of signals we have. Actually, let me start by asking for those wiser than I to educate me, (and others) about the different types of US signals, and the names of the different kinds. I know there were a lot made by SMMdigital, and I know that they are gone. (At least for now.) I would like to learn about the names and types of signals used on he various class I US railroads. I've used google, but my luck in this field has been very slim.
Thanks a lot guys!
For example. Can anyone tell me what these are?



"The trouble with a one track mind is it's narrow gauge and lack of switching controls." - Buzz Baxter