Tuesday, February 21, 2017

A gigantic machine lays high-speed rail track girders so fast! China has more than 22,000 km of high-speed rail tracks, longest in the world.
LikeShow More Reactions
Comment

No comments:

Post a Comment

US Tech restricted to Huawai and ZTE ON  APRIL 22, 2018  BY  NARESH SAGAR LEAVE A COMMENT EDIT U.S. regulators tighten the leash on ...