Figured I would post what I have come up with after all the assistance I received.
I finally got the basic detailling work on my SW1200 done. I haven't gotten a chance to weather it but I figured I would post it as is.
You guys make a good point. Just look at all the variations of exhaust stackes that different roads used.
Mike.
My You Tube
wjstix...I'd suggest finding out what kind of horn the actual railroad used, and see if anyone makes a model version.
I agree: between Detail Associates, Details West, Cal Scale (Bowser). and Precision Scale, the horn you need has gotta be out there.
Wayne
Yup, it could be the horn the model came with wasn't correct for the railroad you decorated for in the first place. The railroad I grew up watching had SW-1200s with Hancock Air Whistles instead of horns. Some railroads had single-chime BLAT horns, some had multiple chimes. I'd suggest finding out what kind of horn the actual railroad used, and see if anyone makes a model version.
If there is a historical society for your prototype, check with them for the correct horn. As far as I have seen, similar locos on different roads could have different horns, it's not a one horn fits all type thing.
Good luck,
Richard
After rereading his post, I think your right, Overmod. I came up with Detail Associates part# AH1608, Leslie Tyfon A200.
There are some on Ebay.
I think what he's asking is what the precise detail part should be. I'm thinking Leslie A200.
Lots of detail and discussion on the Web but to get you started with dimensions:
https://goo.gl/images/qJx5q6
If you have the horn, I would try to put it back on. If the horn flew off to places unknown, you could take a single horn from a different set, maybe snip off the longest one, and mount that. There are a couple of different methods I can think of to make a sturdy replacement.
I think the easiest would involve drilling a small hole in whats left of the original horn base, that the replacement horn would fit into.
Another thought, I've made bells by chucking a piece of sprue into a drill, and turning my own. You could do this for a new horn replacement.
You might check into Details West, or Detail Assc., or other detail part suppliers, even a seach on Ebay.
Got yet another one for my forum friends: I have a P2K SW1200 that I repainted and relettered to match a prototype. (Couldn't find a stock painted unit at the time.) In the process, I managed to break the stock horn. I strongly doubt that I can find a stock replacement, so any ideas on what would be the right detail part would be most welcomed.