Railfan Technology > Tank/compressor for train horn

So, I'm going to be attempting to build a set of PVC train horns based on dozerboymiller's plans that I have had for a few years.  Just something to replace the spot where a $1000 train horn would fit, but I don't have that kind of cash...lol.  I'm looking for a set up to go in my truck, but I'm not sure how big of a tank or compressor would be needed.  Anyone have any suggestions?

Also, I'm aware these are not to be used willy-nilly, they will be limited to private property and off road use, and used on occasion to goof around.  I'm a little more mature than that :-)

Send a PM to M1BPRR here on TO.   He can give you a full education of horns on trucks.