at some point i will put sound in my units but i want an accurate SP horn... so what did they use for C44-9s, AC4400s and SD70s.... i know there is a difference between SD70s and AC4400s if you know please list the horn that goes with each of the 3 types of locos i just mentioned thanks guys! and in you opinion which would best suit an SD70ACe?
The big GEs had Nathan P-3s, and IIRC the SD70Ms had Nathan K-3LAs or P-3s (horn swapping going on). As far as the SD70ACe, I don't think a mythical modern-day SP would have a choice in horns; the standard horn EMD has applied to all SD70ACe/M-2s is the Nathan K5LLA. IIRC, it's for standardization, as well as meeting federal maximum/minimum horn volume requirements.
ok thanks! sounds right although the d70s i have heard blow their horns in my dvds don't sound like either of those but thats pretty close to the ac4400s
so would the p3 still be able to be used today with the new laws about loudness of the horn or would it be replaced with something else? of replaced what with? wondering this so i know what to have my Gevos programmed horn wise.
As far as applications on new locomotives, I dunno; I'd presume with the requirements and desire to standarduze, they'd have to go with the K5LLA, like every other SD70ACe/M-2 built to date.
