This is the 17517th most frequent Russian word.
трамвайных
"Трамвайных" means "tram-related" or "pertaining to trams."
In this sentence, 'трамвайных' is used as an adjective describing 'маршрутов' (routes), indicating that the routes are specifically associated with trams.
Я увидел расписание трамвайных маршрутов на остановке.
I saw the schedule of tram routes at the stop.
Here, 'трамвайных' modifies 'путей' (tracks), specifying that the tracks being repaired are for trams.
Рабочие занимались ремонтом трамвайных путей в городе.
The workers were repairing the tram tracks in the city.
In this example, 'трамвайных' acts as an adjective describing 'линий' (lines), referring to the lines designated for tram transportation.