How Do You Build A Raised Metro System? - #261

Why, with one of these babies of course... how these things balance, I'll never know. Any structural engineers out there to explain these things further?

Dubai is constructing a large urban metro system with both under and over ground sections. The raised sections are starting to rally take shape and once finished they will be a massive improvement for Dubai.

Plus they look pretty cool - going under some bridges and over others...