add this answer ''Вартість проїзду тут дуже дорога.''
A fare as it is cannot be viewed as an item you can buy. Therefore it can only be described as high or low. Never expensive or cheap. Think.
The fair? Or train?
"Train" would be "поїзд" not "проїзд."
Проїзд can be used for any kind of public transport: buses, metro, trains.