noooooo Komemiute (Khannnnnnn) its not enough that there is a level crossing about 300m from my station, that the trains have to signal at. Now I am hearing the bloody whistles here aswell … 
They might be the thinnest wheel spokes I’ve ever seen.
Jesus… Poor animal.
I cannot remmember what i did, but it slipped and ended up like that. I think I moved another wheel from the stack.
However much I tried I couldn’t get it to sit like that again on purpose.
This one I remmember.
I was picking those tires for an order and i rolled them one by one, from beyond the pallets visible in the upper right corner. They rolled lazedly around in a couple of circles, until they tipped over and ended up leaning against each other like that.
My jaw was on the floor.
So…somebody went out and recorded all those clips. Then they carefully went through them to select and capture the begets were the doppler shift of the train’s horn matched a particular note.
Realize that this is a function of at least three things:
- the specific frequency of the train’s horn at rest to the observer…i.e. its “Note”
- the speed of the train as it approaches i.e. as the train slows the doppler shift drops toward the specific frequency of the horn.
- the change in doppler shift as the train approaches the observer. i.e. since the observer is standing to one side, the doppler shift changes as the train passes-the velocity vector relative to the observer slows until it is 0 the moment the train is perpendicular to the observer.
It is also a function of the speed of sound at the daytime and the position where the observer made the recording so temperature, barometric pressure and humidity also played a part.
So not something you are going to just slap together in an afternoon. Maybe we should hook this guy up with the musical melons dude.
…and the little boxy blues and silver commuter train was a bit flat. 
To be fair, I think it’s smarter to do it in another way.
You record a bunch of train horns, like - a big bunch.
Then you simply sort them according to note and pitch…
Or whatever note’s characteristics are.
Then you simply build the video picking the notes with the correct pitch (or whatever) from your train horns database.
Admittedly some notes can be harder than others to find…
Well for those if you are close you could always adjust the playback speed of that clip slightly. We likely wouldn’t notice a small change like <10%.
Back when I worked on radars, if the doppler got too low we would just add a cup or two… 
Oh I agree! 
That’s definitely the way to do it.
That said, if one has a good ear, and one of the little key note things you blow into, you might go through the entire set of clips and note where different notes are located, i.e. the Prague Commuter Train - Dolní Břežany station Clip, 2:32.5 to 2:38 = B-flat, first octave above middle C. So you fill in your scales. Then you get the sheet music of what you want and just pick and choose.
I would imagine that you would need at least whole notes collected and then divide them up to the shorter notes accordingly.
Regardless of the way that they did it, somebody had a lot of time on their hands. 
Oh, that’s for sure!
In eastern Austria, cheap locally produced wines were often sold in two liter bottles informally called “Doppler”, which always leads to a really stale joke when the Doppler-Effect is brought up.
