I was also suprised they couldn't go faster. Maybe energy efficiency? That is the only reason you would go slower. Maybe they are trying to make this thing hyper-efficient energy wise.

But this project is awesome for two reasons: one, I've always wondered why this sort of thing isn't automated. We could even have humans moving small packages intra-city underground on conveyor belts.

And two, I live in Zurich, so being close to what I believe is the first project of this type ever, is super cool.