This is the 17564th most frequent Russian word.
троллейбусе
"Tроллейбусе" is the prepositional case form of "троллейбус," meaning "trolleybus" (an electric bus powered by overhead wires).
In this sentence, 'троллейбусе' is used in the prepositional case after 'на', indicating the location or vehicle mode of transport used.
Я часто езжу на троллейбусе, когда иду на работу.
I often ride the trolleybus when going to work.
Here, 'троллейбусе' is in the prepositional case following 'в', indicating location within the trolleybus.
В троллейбусе было много пассажиров утром.
There were many passengers in the trolleybus in the morning.
In this sentence, 'троллейбусе' is used in the prepositional case with 'в', referring to the place where the bag was left.