This is the 308th most frequent Catalan word.
portar
"Portar" in Catalan means "to carry," "to bring," or "to wear."
Here, 'portar' signifies 'to carry' referring to physically having the keys in a location.
Porto les claus a la butxaca.
I carry the keys in my pocket.
Here, 'portar' is used to mean 'to wear,' describing the action of having elegant clothes on.
L'Anna sempre porta roba elegant.
Anna always wears elegant clothes.
In this case, 'portar' denotes 'to bring' or 'to transport,' as the train is transporting the passengers to the city.