Who needs a train horn? Are you guys trying to alert the trains of your right of way at the crossings?
Would not have expected a person who has an S/C 7.3 to ask this question.
I had the 4 horn shocker XL horns with the dual compressor with 2.5 gal tank on my Jeep TJ, they were loud to say the least.
Have never heard a real train horn setup or anything better besides on a well real train. lol
When it comes to loudness I have noticed the placement of the horns plays a BIG role in how they sound going down the road.
Also IMO get as big of a tank as you can, the 2.5 gal and dual 425cc iirc was just not enough for my taste. its been awhile but I think it was like 10-15 seconds before it started to fall off, and the compressors would kick on almost instantly from hitting the switch.
I know I will be trying to squeeze a set in my next commuter car for when I deal with Jersey drivers. lol