This is the 11842nd most frequent Polish word.
krajowa
"Krajowa" means "national" in English.
Here, 'krajowa' describes something belonging to the nation or country, in this case, the administration.
Administracja krajowa wprowadziła nowe przepisy.
The national administration introduced new regulations.
In this usage, 'krajowa' modifies 'card', indicating that the card is intended for use within the nation's transportation system.
Mamy kartę krajową do podróży pociągiem.
We have a national card for train travel.
Here, 'krajowa' indicates that the offer encompasses items available within the boundaries of the nation.