The Monster That Walks Over Empty Air

How do you build a 200-mph bullet train railway across bottomless mountain ravines where cranes can't reach? You build a 92-meter mechanical beast with 64 wheels that literally walks across empty air.
Meet the SLJ900/32 (nicknamed "The Iron Monster") — a 580-ton mega-machine that carries 900-ton concrete bridge spans over 400-foot drops without ever touching the valley floor. In this documentary, we explore the jaw-dropping engineering behind the world's most extreme bridge launcher, how it threads through tight mountain tunnels with inches to spare, and why it changed high-speed infrastructure forever.

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