ok if you do what you do is you follow one person (19 people need to be following) and then go on the train and theres the badge I really want to do it if you want to do it say yes and meet me in mallos means not in the train station.
That one doesn't involve the subway system. The "train" part refers to all the people following you. It is just required that you visit 5 diff locations with those followers.
I would love to do it! There are tons badges alike this and I'd love to see someone organizing a party especially for all of us help each other and complete those badges once at all!