A simple question on dwarf signals

I use them on passing spurs and have them go to green when the switches are aligned to have trains enter the spur. They are visual aids. I don't know if that prototypical, but at least I am consistent on the three passing airings that I have. All the best

Dwarf are used in terminals to regulate movements of trains through the maze of tracks and on to the main.

In the subway yards I worked in, the dwarf signals faced trains in the spur, protecting the ladder track leading into the mainline.

 

Larry

BOB.....if you use only one it should govern a move off the siding on to the main track. otherwise you would need three dwarfs one for each direction over the switch. in the case of the single dwarf...the train dispatcher would have to authorize a move off the siding after displaying a more favorable signal than stop. then a crew member would open the switch let the train out and close up the switch.....thats it !! conrail john

According to the "Political Correctness Handbook", these should be called "Height challenged signals".

Thanks for all the replies.  I appreciate all the wisdom (and humor) in this crowd!