1/2” air actuated valve for train horn???

That is interesting. Looks like a Bendix QR-1 quick release valve with an electric solenoid on it.
The china power products train horns I have, have a electric solenoid on them with 1/4” nipple for air. Problem is you just can’t feather the switch to get the authentic Casey Jones sound. Lol!

 

I have hornblasters now
Had the $200 Generals on last truck and although the HB is really loud it seems the Generals had a better lower sounding tone??

On sale now
Admiral Chrome Train Horn

 

And when properly plumbed, do people that cut you off end up questioning life choices???? That's my goal.

 

I had used the 1/4” line that came with my first set
Didn’t have enough push
Changed it out to 1/2” and a switch

Had a Cherokee in Vegas that started to come over and would have hit my front fender
Hit the horn and he pulled back so hard I thought he was going to roll

Same in California at like 430am
My right lane was ending so I put the blinker on
Guy in left lane backs off to let me in
Some idiot that must have been right on my rear bumper jumps out and is now in my way
She gets along side me and I hammer the horn
She got out of the way and pretty sure spilled coffee if she had any