One of my problems is that in learning Ukrainian over the past few years, I have a BIG problem with distinguishing "на" versus "у/в" for the prepositions "at" versus "in". How would one express this sentence in Ukrainian - "My friends are in the train station." (This sentence expressing the fact that my friends are actually physically inside the train station building as opposed to a general spatial location.) Or does "на вокзалі" convey spatial information that they are inside the station building?
Some nouns traditionally use на. "У вокзалі" sounds really strange, if you need to specify that your friends are in the actual building you can say "у приміщенні вокзалу" (that's literally "in the train station building").
The thing is, "train station" is actually залізнична станція in Ukrainian. And "вокзал" is a station building. But we commonly use вокзал to refer to all the station complex. And станція is used more for suburban stations or stations in countryside.
Oh wow...залізнична станція sounds like a literal translation of "station of iron", much like the old French "gare de chemin de fer" - "station of the path/track of iron" where train was signified by "chemin de fer" - "path/track of iron". Thankfully now train station is simply "la gare" / "вокзал". . . :)