It explained that this was "because the previous train, an engineers' on-track machine, had passed through the crossing in the opposite direction to normal".

BBC: Barriers 'held down longer' in Somerset rail crash

"You can't proceed under business as normal when there's no clear direction out there, " he said.

WSJ: Political Uncertainty Puts Freeze on Small Businesses

The best limits they can suggest is that they are less than 110 times more susceptible to gravity than normal atoms, and less than 65 times that strength, but in the opposite direction: antigravity.

BBC: Antigravity gets first test at Cern's Alpha experiment