This is the 497th most frequent Russian word.
станции
"Stations" (plural of "станция").
Here, 'станции' is the genitive singular form of 'станция,' used in the prepositional phrase 'у станции' which translates to 'near the station.'
Мы стоим у станции метро.
We are standing near the metro station.
Here, 'станции' is the prepositional singular form of 'станция,' indicating location ('at the station').
На станции остановился поезд.
The train stopped at the station.
In this sentence, 'станциях' is the prepositional plural form of 'станция,' used to indicate location in a plural context ('at the stations').