Airchime M3H

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

AirChime M3H