I've been using JnJ 5-chime FWD "Amtrak" horns as stand-ins, but I'm not sure if they are available anymore. Someone mentioned a plastic Atlas part but I think the hoarders have snatched them all up - I could never find them listed on their site. The new BLMA brass 5-chime units look better in person than they do in the advertising images!
Not all 5 chimes are created equal. BLMA is a Leslie, while the Atlas is a Nathan. Nathans are noticeably smaller than Leslies as well as the pattern of their frames too. The S.
BLMA makes three different 5 note horns. Leslie S5T and S5T-R and a Nathan K5HR24. Here is a link to the web page http://www.blmamodels.com/cgi-bin/webstore/shop.cgi?ud=AQkADQgIAg0DBxQUEBEcHAQECAIBBQcECQkTEQAA&t=main.red.htm&storeid=1&cols=1&categories=02002-00013&c=search.red.htm&&scount=11
If I remember correctly, C&O F7s had the Nathan M5 horns. The Western Maryland F7s had dual Nathan M5s. I'm not positive, but I think the WM FA2s had Nathan M5s, too. EDIT: I just went to the BLMA site - looks like the Leslie S5T will need to be the stand-in for the Nathan M5 horns...
This is about as good as a photo of the horn that you will find... http://rr-fallenflags.org/co/co7016.jpg and the horn, to me, looks pretty close to the Leslie S5T. Interesting, really, that all the "chimes" are in one direction but I would guess that this is because the F7As weren't expected to lead a cut of cars in reverse. In looking at the Leslie S5T it appears to be a good horn for most Southern engines as well.
I see that JnJ Trains still has 5 chime Leslie and Nathans: JnJ Trains Also listed on Walthers web site.
Nathan M's are definitely made...I have a few that I had picked up from a random individual at a trainshow that had a slew brass parts years and years ago, when the second-hand market was ripe. I wouldnt be surprised if BLMA comes out with a Nathan 5 chime in a year or so based on their current offerings. The S.
Just in case a potential manufacturer of N detail parts is monitoring this post: WE NEED NATHAN 5 CHIME HORNS - M SERIES!!! :tb-wink: