Zipper truck
¯\_(ツ)_/¯ (Unknown Poster)
on 9/18/20 at 12:38pm
The "Zipper Truck" supports the arch of a tunnel until the last blocks are in place and the rollers allow it to drive out
Found on imgur (https://imgur.com/CIRiK10) | Posted: 2020-09-18 12:38:17