I'm trying to find some information on the door buzzer codes used on the MNCR, but I haven't been very successful in my searching. Just from observation, I know 2 buzzes means "all clear" (or something to that effect), and 3 means "back up". I've also noticed when they are using platform extenders, 1 buzz apparently means "close to platform".
Are there any more codes in use, and what are the more correct names for those codes? Also, is this something railroad-specific, or is there a general rule regarding the door buzzer?
Are there any more codes in use, and what are the more correct names for those codes? Also, is this something railroad-specific, or is there a general rule regarding the door buzzer?