1952 subway tunnel cleaning machine.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
Previously:
Tunnel washing truck - videos
Leggers moving a boat through a tunnel - photos
Timelapse disassembly of Big Bertha tunneling machine - GIF and video
Constructing a tunnel under a highway - GIF
Tunnel construction GIF
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