There is a freight train grade crossing nearby, and there is an official sign which reads "NO TRAIN HORN" and then below it, there is very meticulous lettering

There is a freight train grade crossing nearby, and there is an official sign which reads "NO TRAIN HORN" and then below it, there is very meticulous lettering reading "EXCEPT SOMETIMES" and I swear I have never quite figured out whether it is official, or some joker's joke that's been permitted to stay there for years on end.