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It's a game. You're supposed to click on the different route options that are presented to you on the bottom of the screen. That's why it goes slower the more options there are.

But I also just followed it for the first time from beginning to end, not doing anything. Because I assumed someone had already done the math.

I did the same on the first ride. It is a game, you have to go jumping on different lines to get your longest.

Isn't it _just_ the U7 that's longer? The U5 is the 2nd longest and that's 22km and just a ~45 min ride.

Can you please elaborate more on these issues?

Delays, vandalized carts, people jumping on tracks, intoxicated people on the train, buskers, no AC in the summer / heating in the winter, people talking on speakerphone / not wearing headphones, ...