This is basically GotLag's work. I just added a horn to cars and tanks and removed the restriction on manual control just to use the horn on trains. I also set the default config for trains to _not_ honk when they're stopping and starting.
Counted when a user downloads a mod release for the first time. Before Nov 2021 it counted everytime a user clicked the mods download button.
Counted when a user downloads a mod for the first time. Has no data before Dec 2022