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