на станции собралась толпа школьник

на станции собралась толпа школьников; они ждали прибытия поезда

Результаты (английский) 1:

at the station a crowd of schoolchildren; they waited for the arrival of the train

Результаты (английский) 2:

at the station a crowd of schoolchildren; they were waiting for the train's arrival

Результаты (английский) 3:

at the station a crowd of schoolchildren; they were waiting for the arrival of the train