For the last four days, MUNI contractors worked around the clock replacing tracks at the corner of 30th/Church in San Francsico. It cost $3 million. Using a Canon A590, Ken Murphy made this incredible 12-minute time-lapse video of the construction.

Via Murphy's Vimeo page, here are more details about the video:

This is a time-lapse video showing the replacement of the MUNI tracks in front of my house. Demolition began on the evening of Friday, October 8, and work continued around the clock until early in the morning of Tuesday, October 12. The MUNI folks were nice enough to distribute earplugs to those of us in the immediate vicinity.

This was shot using a Canon A590, with CHDK installed (a firmware replacement for Canon cameras that enables all sorts of additional features). An image was captured approximately every 15 seconds.

[Vimeo via Fark]