Surely not stopped between stations, would it not be better to get the train held at the next station by activating the alarm upon the train stopping?
That's true. On a train, you're best to wait until you're at a station before activating the alarm, because then a paramedic can get to you. Out of curiosity, if you were on a limited stop service, would the guard/TTI be able to contact the driver without stopping the train to tell him/her to make an additional stop at the next station?