Task: Question Answering
Input (English): Passage: My friend and I left our hotel early , about 6:30 . The walk took about fifteen minutes to the station . We had to walk down a long flight of stairs down to the station . We took out our automatic payment cards , walked up to the barrier , and swiped them across the electronic reader . The barrier opened to let us in . We confirmed that we would have to change trains halfway there . We looked at the signs to locate the platform we needed , and walked down another flight of steps to catch our train . We waited on the platform at a safe distance until the train came roaring in . It was mostly empty and we were able to find seats . At the third stop we got off and quickly walked up another flight of steps to locate the platform for the next train . In two minutes our next train arrived and we got on . This train was crowded and we had to stand . We left the train and walked towards the exit . We passed another set of barriers and swiped our cards again , and then took an escalator up out of the underground to the street . Question: When did they enter the train? Option1: after the train left the station Option2: When it stopped
Output (English): When it stopped