This is the 4270th most frequent Polish word.
dworcem
"Dworcem" means "station" (instrumental case).
In this sentence, 'dworcem' refers to the structure of the train station as a location and uses the instrumental case.
Spotkaliśmy się pod dworcem, aby razem poczekać na pociąg.
We met under the train station to wait for the train together.
Here, 'dworcem' refers to the train station as an object characterized by its architecture and is used in the instrumental case.
Był zachwycony pięknym architektem dworcem w tym mieście.
He was delighted by the train station with beautiful architecture in this city.
'Dworem' in this context refers to the train station as a landmark being approached, using the instrumental case.