Train Drives Through Bangkok Market - and it's No Accident

"Train Drives Through A Bangkok Market - Video"
Maniac World (undated)
video 0:40

"This is an amazing and efficient market place operation. This village in Bangkok operates like a MASH unit in how fast they can fold/unfold their business operations when the train passes through...."

This is quite a remarkable video. I'd like to know how this custom developed.