To start, click and drag the speed lever forward to start driving along the track.
Tram stops will appear on the right hand side of the tracks every so often.
When you see a stop with an NPC waiting at it, be sure to slow down and stop beside it.
Look to your right and drag the door lever all the way to open the door.
After the NPC has taken their seat, the door will close and you can set off again!
After a little while, the NPC will alert you that the next stop is theirs, be sure to stop there and let them off.

Controls:
This game is played primarily using your hand.
Buttons, Levers, Pulleys, and Sliders can be interacted with via clicking and dragging / holding.
Look right at the door, and up at the mirror.