In this thread the goal is to make construction project that are WAY oversized and preferably world changing on a gigantic scale, but don't require ASB intervention.
Throw in Alantropa and a bunch of the Plowshare projects...
And wasn't there that plan to damn the Med ?
This is pretty darn construction-wank: The Gravity Express.
It does look pretty magnificent. I'm pretty sure Brunel tried to get the government interested in a broader standard gauge, but was ignored or rejected. I found another site (in German) with a few more pictures. The most interesting of which may well be the attached.
Why would you do that? Why?
For some reason, it reminds me of the Soviet Union's massive canal system, which allowed many of the Soviet Union's big ocean-going ships to be constructed thousands of miles inland.