How To Build A LEGO Railroad Crossing Cantilever/Gantry - YouTube
Tsung-Han Hsieh 謝宗翰 » LEGO Atomic Force Microscope
This guy's LEGO IDEAS fan model called "The World of Civil Engineering: Types of Bridges" is the first-ever showing a balanced cantilever bridge under construction (with rotatable crane). Already has over 1,600