Identifying train horn

Main Train Horns
1

There is a horn that is quite unusual for Canadian Pacific Train. I have heard a few times and finally got the engine number. So Does anybody now the type of Horn being used on CP rail engine Number 8792 a GE Dash -9

Thanks

2

The one I saw looked to be a 3 horn one. It did not sound like the normal CP Rail horns

3

Sounded more like a K3H American tuned