What kind of horn is this? (on BNSF #2083)

[Ragnar]

I hear a variety of horns throughout the day, some more melodious than others. This morning BNSF 2083 went by in Seattle and I thought, "wow, that's a nice sounding horn!" Can anyone tell me what kind of horn is on the #2083? Here's the best pic I could find online:
http://www.rrpicturearchives.net/showPicture.aspx?id=1341649

 

[RailroadJeep]

I'm no horn expert, but that looks like a RS3K...

 

[cnw8717]

Chris got it correct.

 

[Ragnar]

I see Seattlerailfan even captured it in one of his videos...

 

[RailroadJeep]

RS3K for sure, but its equipped with a horn button & magnet valve... No horn play when whistling for a crossing.

One of my favorites is hostling some of those CSX or NS motors with a 5 chime I can "play" with when whistling. Those make for a happy hostler!

 

[Ragnar]

RS3K for sure, but its equipped with a horn button & magnet valve...

Magnet valve! Say it isn't so. You can tell how little I know about horns since I actually thought this one sounded good.

 

[K-dub]

One of my favorites is hostling some of those CSX or NS motors with a 5 chime I can "play" with when whistling. Those make for a happy hostler!

These are swiftly being modified to "electronic" control as well.