This is the 4477th most frequent Polish word.
kolejowej
The Polish word "kolejowej" means "railway" or "railroad" (adjective form).
The word 'kolejowa' describes the station that pertains to trains or railways.
Stacja kolejowa znajduje się w centrum miasta.
The railway station is located in the city center.
The word 'kolejową' is an adjective modifying 'line' to indicate it is related to a railway.
Podróżujemy linią kolejową do Krakowa.
We are traveling by a railway line to Krakow.
The word 'kolejowej' is an adjective describing the infrastructure as associated with the railway system.