Back in BR days I was once travelling at night from York to Kings Cross in the restaurant car of an HST.We stopped at Peterborough and, after departing, I think the driver thought he was on the up fast because when we reached the river bridge we very suddenly lurched left, right, left as we passed through the points to join the up fast. Everything on the table hit the floor, there was a massive cry from the kitchen and a cook had a big gash in his arm, walking back down the train to find the Guard or Conductor people were picking up cases that had fallen, replacing what had been on tables but had reached the floor. When I found the Conductor I told him I was an Engineer and that I was concerned that the track could have been damaged by what was clearly excessive speed and asked that he get the driver to stop at an appropriate signal and report the incident to the signaller so that an examination could take place, this duly happened. Upon reaching Kings Cross there was a reception party waiting to talk with the driver!
The other known "lurch" was at Gidea Park on the up fast, used to wake me up in the mornings in readiness for getting off at Liverpool St!
