No. "Minél" means next to something, while "min" would mean on the vehicle itself. So if you say "villamoson" it means you're on the tram (and possibly travelling), while "villamosnál" means you're standing next to the tram.
-------- duo means that the boy is standing next to the train, waiting for somebody . and, whoever he's talking to on the phone has a friend who asks, "What is the boy waiting by, the train or the tram?" not so weird . . .