Skateboard, roller blades or? So this isn't precisely about bicycles but it's pretty close, right? Please point me to a more relevant Stack Exchange forum if there is one.

I am trying to optimize my daily commute. I usually walk slightly over a kilometer (slightly under a mile) to the station I depart from and about the same distance from the station I arrive at to my destination.

There are buses, but those are a bad option due to heavy traffic. I can rent a city bicycle for my "home - station" segment, but not for the other segment. So I settled on bying a... "personal transportation device"? (is there a word for it?)

There are lots of them on the market: skateboards, bikes, electric skateboards and electric bikes, roller blades, Skyrunners, waveboards and longboards, scooters... I need to pick one that is


Fast (my goal is cutting travel time, after all)
Small, so that I can take it with me on a train. Moscow Metro doesn't allow bicycles, because this.


What would be my best bet?
Boards are bad because you can't stop quickly.

Skates are bad because they're a pain to put on and take off.

I would go with either a heavy-duty folding scooter or a folding bike. Both are fast and reasonably small.