National Wonders are done. We have 18 total (including kept/modified existing ones). 4 are completely new. I'll post details later.
I've left out MagLev trains for now, because I want to do more with it. I want to make MagLev a new terrain improvement, an (expensive, time consuming) upgrade to railroads. On our starting map, this will only exist where current maglev lines do.
A civ will have to research a tech, build 3 or 4 buildings (
maglev stations ), which will unlock a national wonder (central maglev station). After they build that, their workers will be able to build maglev lines. The AI should be able to do this, as long as we keep it exactly the way railroads work.
Foreseeable downside: Once the AI has the ability to build these lines, as far as I know, it will stop building regular railroads. So if we make it too time consuming to build, it will hurt AI civs that are trying to improve areas without roads/railroads (it will be forever before they have any improvements, since they will skip roads and railroads). Maybe we can reduce this effect by reducing the build times for these once a player enters the future era.
What do you guys think?