To stop the car in which the plaintiff's intestate was riding at the place shown by the evidence would not warrant a finding of negligence. It is common knowledge that all the cars in a long train ordinarily cannot be stopped opposite a station platform. Tsatsos v. Boston, Revere Beach Lynn Railroad, 267 Mass. 365, 367. The circumstance that the trap provided for covering the steps of the coach from which the plaintiff's intestate stepped or fell was not down at the time of the accident would not warrant a finding of negligence. It had been raised to permit persons to board and to alight from the car at Gardner, and it would not be reasonable to hold that it was the duty of the defendant to close it before the train had passed the station.