There's two ways to do this
Buy cheap horns, small tank and just use a tire chuck to fill it every time
Or, fork out over $600 for legit train horns, 10 gallon tank and on board compressor. Real train horns are stupid loud
Iv looked a lil more into it and the Dillion as some features that really appeal to me. Low primer indicator, a stand, etc.
I'd like to check one out in person soon