Oh, Canada...

[Enzo]

Well I like railroads. In 1976, we had a bicentennial train running around the USA, a steam locomotive all painted red, white, and blue. I was lucky enough to see it pass by through EAst Lansing one afternoon. Pretty cool.

But I had no idea the Canadians did something similar for their 1967 centennial.
http://expo67.ncf.ca/canada_confederati ... 67_p1.html

Not sure if this will work, but here is a sound clip of the special horn on the engine that played the first few notes of O Canada.
http://www.railfame.ca/documents/induct ... daHorn.mp3

[wring]

I just clicked on the sound thing, and over there on the couch, some lump said "guess it worked".

[Lance]

What a cool horn!

[g-one]

A train horn is one of my favourite sounds, that one is extra cool.
I don't remember hearing about that at the time, but was quite young. Though I would have remembered if I'd been taken to see it.
It was fitting for them to do this for the centennial, the trans-continental railway completion was one of the defining moments around Confederation:
https://en.wikipedia.org/wiki/Last_Spik ... ic_Railway)

[Enzo]

I am looking for it, but on MEF a long while back I posted a chart of railroad horns by make and model, and what RRs used which. They are tuned to chords, some of the guys thought they were random notes.

Try these:
http://www.dieselairhorns.com/collection.html