This is the 10075th most frequent Russian word.
багажных
The word "багажных" is the genitive plural form of "багажный," meaning "of luggage" or "luggage-related."
Here, "багажных" is used as the genitive plural form of "багажный," modifying "ящиках" (lockers) to indicate their association with luggage.
Мы оставили свои вещи в багажных ящиках.
We left our belongings in the luggage lockers.
In this sentence, "багажных" acts as an adjective describing "перевозчиков" (porters), implying that they deal with luggage.
На вокзале мы видели багажных перевозчиков.
At the station, we saw luggage porters.
Here, "багажных" modifies "тележками" (trolleys), specifying their function related to luggage.