This is a post from a local forum. Would anyone be able to shed any light?

"We are woken every morning by a fast train around 6am, which shakes our
house. This train has much more of an impact than the other trains
throughout the day, and I am concerned it is the cause of a number of cracks
that have started appearing inside and outside our house.

"Is anyone else experiencing a problem since this train started passing
towards the city from the Wimbledon direction?"

Thanks,

Ian