Ok, so, the story so far is this, I have since had a good look over these Horns & have found out the following about them.
They are K2 Airchimes made in British Columbia in Canada.
Here’s some interesting stuff I have managed to pull off the internet about them.
The K2H with bells 1 and 2 plays D# and F#, a minor 3rd interval.
Los Angeles-area commuter railroad Metrolink’s Guardian-fleet cab cars have K2H horns using the #2 and 4 bells. The horns are mounted under the floor and behind the pilot to try to direct the sound down the tracks and minimize noise complaints from surrounding neighborhoods.
Some Railpower RP20BD and RP20CD genset locomotives have a K2H mounted in front of the cab in combination with a separate KS2 mounted on the rear of the cab as shown the third photo below.
Not all Railpower gensets use this arrangement; many are fitted with a single K3LAinstead.
The 1975 Nathan Airchime catalog lists the K2H as a “standard 2-tone locomotive whistle as supplied on export locomotives.” Not many have apparently been supplied for use on domestic US locomotives. One early domestic use of the two-chime K-manifold was on Amtrak SDP40F’s, which began to trade their Leslie SL4T horns for K5LA’s when the latter became available in 1975. On the second order of SDP40F’s, the SL4T horn had been split over two manifolds for lower clearance, and the replacement K5LA’s were likewise split, using a standard low profile 3-chime manifold and the K2H 2-chime manifold. Photo courtesy Ed Kaspriske.
The K2H uses K-bells 1 and 2 attached to the sides of a special narrow manifold. This particular horn is fitted with optional screens over the bells to keep debris from fouling the horn.
Brand new from AirChime in Canada, a single-chime K1 horn is $1236
(U.S. dollars). As far as I know, this is more than the cost of an
entire Nathan K5LA. I’ve never seen a Nathan single chime horn get
anywhere near $412 on eBay either, so I think the comparison is valid.
Yes, AirChime produces a superior product in Canada, and it costs a lot
more than the Nathan horns too. Collectors know this too, check out the
final price on eBay item 4548742763. That’s a lot of loons for a
I wasn’t going to list my most recent findings on AIRCHIME or this subject tonight but since the K horn topic is so hot right now i will tell everyone what i recently discovered. I have contacts overseas and they buy from Airchime. The diecast quality of the brand new KS2 he sent me that had a tag from AIRCHIME Langley British Columbia was just unbeleivable. Im almost thinking that this horn was produced by someone else or in a different diecast mold. It was just perfect, with no slippy rush grinding marks or gaping seams or holes that’s on all todays horns that need ground off etc, and the machine work behind the backcap is just as nice. Nothing like what we are getting here in the states today from Nathan… that’s for sure. Could it be they are producing a better quality product for the over sea’s market? Probably ! … i now have the proof they are and can still make a decent quality horn.