True, there are more people in a mall, and you don’t need a long time to move through piece by piece…. as you need for the train. What if the train stops? This

True, there are more people in a mall, and you don’t need a long time to move through piece by piece…. as you need for the train. What if the train stops? This can be done by any personell quickly. Doors and windows of trains can be opened everywhere, they are designed that way. Stop the train, intercom and tell people to leave the train and the situation is over. Chances are this will turn out differently than you assume