AirChime M3H

The M3H was introduced in the early 1950's to comply with Canadian regulations that mandated the D# minor chord for locomotive horns. The horn used bells #2, 3, and 4 from the M5 fitted with the #1, 2, and 4 power chambers respectively. The picture illustrates an all bells forward M3H produced by AirChime licensee Holden Ltd.

A rear view of an M3HR, with one bell reversed. All horns and photos courtesy Brent Lee.

Factory tuning for the M3H was: D# minor triad (D#, F#, A#).

The M3H has been largely supplanted by the low-maintenance K3H, and no new M3H's have been ordered for locomotives since the late 70's or early 80's. A dwindling number of M3H's can still be found on former Grand Trunk Western locomotives.

M3H sound samples:

Horn courtesy Brent Lee:
Sample 1...641kB...29 seconds

Horn courtesy Mike Muha:
Sample 1...158kB...7 seconds
Sample 2...303kB...14 seconds

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