Public transit shouldn't be expensive. It shouldn't pretty much ever run outside the red. The whole point of it is to incentivize its use and promote efficient means of travel. The only reason to charge at all is to disincentivize unnecessary consumption of it.

If you are doing city planning you want as many people on the Subway as you can get. It enables greater density at ground level and is much cheaper to maintain (if you maintain it) than overcongested road networks and the required parking.

Gitbook (powering the documentation in this link) is also using Slate but they Forked it.

Here is why https://github.com/GitbookIO/slate/blob/master/Readme.md

All slate repos @ https://github.com/GitbookIO?utf8=&q=slate&type=&language=