LIRR MU Train Horns

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Head-end View
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LIRR MU Train Horns

Post by Head-end View » Mon Aug 26, 2019 7:39 pm

Is anyone here familiar with the makes and models of all of the horns used on LIRR modern generation electric MU cars? I'm curious to know what horns were used on the M-1's, M-3's, M-7's and M-9's. They all sound different; some better than others. My favorite was the M-3's when they were newer and sounded good. I've always thought the M-7's sounded crappy, even when new, before the muffling devices were installed.

BuddR32
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Re: LIRR MU Train Horns

Post by BuddR32 » Tue Aug 27, 2019 1:31 am

M1 & M3 had/have Leslie type S horns. M1 was a single note, M3 is a dual note.

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Re: LIRR MU Train Horns

Post by nyandw » Tue Aug 27, 2019 7:37 pm


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Re: LIRR MU Train Horns

Post by Head-end View » Tue Aug 27, 2019 7:51 pm

Thanks guys. That page in the link says that M-3's and M-7's have the same model horns. That's hard to believe since they never sounded alike, even before the M-7's had the muffling devices installed. Is it possible for the same horns to sound different on different model cars?

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Re: LIRR MU Train Horns

Post by Fan Railer » Sun Sep 15, 2019 9:41 am

Head-end View wrote:
Tue Aug 27, 2019 7:51 pm
Thanks guys. That page in the link says that M-3's and M-7's have the same model horns. That's hard to believe since they never sounded alike, even before the M-7's had the muffling devices installed. Is it possible for the same horns to sound different on different model cars?
Absolutely! It all depends on the diameter of the air line feeding the horn, and the type of valve connected. And electric solenoid valve (M3) is going to produce a different sound than a manual metering valve (M7, M9).

The M9s use a Nathan K2H model horn, bells 2 and 3B.

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Re: LIRR MU Train Horns

Post by DutchRailnut » Sun Sep 15, 2019 10:44 am

M-3 does not have a solenoid it has Brass Wabco air button

M-7 and M-9 have standard Wabco Horn valve

all 3 can be feathered.
If Conductors are in charge, why are they promoted to be Engineer???

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Re: LIRR MU Train Horns

Post by Head-end View » Sun Sep 15, 2019 8:00 pm

Dutch, what is the difference between that air button and a horn valve?

BuddR32
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Re: LIRR MU Train Horns

Post by BuddR32 » Mon Sep 16, 2019 12:42 am

The button is simply that. A button on the console. It IS an air valve in rudimentary form. The horn valve is a lever operated valve. Pull towards the engineer to sound the horn, like mostly every other locomotive.

Not MU, but if I remember right, the original DE/DM configuration was a button on the console that operated a solenoid valve. It couldnt be feathered, full blast. It was modified to a conventional lever type horn valve (along with relocating/replacing the horns)

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Re: LIRR MU Train Horns

Post by Head-end View » Tue Sep 17, 2019 7:01 pm

Yeah, I remember that scandal re: the DE/DM horns. Standing at Mineola Station and hearing the full-volume pre-programmed grade-crossing sequence was a real experience. As I recall those changes were made in response to public pressure.

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