This happened to us on a tram in Amsterdam- but the other way round- we reached our stop, 6 year old stepped off and people crowded on before we could join him. Lots of people saw and were shouting at the conductor but he just got really cross with us (at least he looked/sounded cross - I don't know a word of Dutch and was obviously panicked!). 6 year old was kept safe by an elderly gentleman. Forever grateful.