As soon as you can, move to a different part of the carriage. If you are frightened, TELL someone immediately. Choose a family group rather than a single person, and ask if you can stay with them until you feel safe. They are marked out in red. If the nearest one is too high, look for another one nearby which you can reach by climbing on a seat.
Tubes have pull down handles and push buttons.
Some BR trains have emergency chains to pull rather than handles. They all have the same effect. Don't be afraid of changing carriages when the train gets in to the next station, if it makes you feel more comfortable. If the platform is empty or there are people on it who make you uncomfortable, you can usually stay near the ticket office, or the ticket collector, until the train appears. Underground platforms Usually near escalators, stairs or lifts, where people will be coming and going.