This is footage I took in 2005 at the Del Mar Fair near San Diego. The fair builds a garden section with different themes each year. 2005 had loads of model trains and their landscapes.
The first half of the footage I played around with the sound and laid a track of train sounds. Using Audacity, I shifted the left/right tracks and volume to give the illusion of the sound moving with the train. I then combined the mono tracks into stereo.
The second half is the original sound from the video.