Поезд, на который мы случайно сели,

Поезд, на который мы случайно сели, был тем, который останавливается на каждой станции

Результаты (английский) 1:

The train, on which we accidentally sat down, was the one that stops at each station

Результаты (английский) 2:

The train, which we casually sat down, was the one that stops at every station

Результаты (английский) 3:

the train, on which we accidentally sat down, was the one who stops at every station.