The crossing sequence should be automatically started by the approaching train, but the RAIB report said that "on this occasion the crossing closure sequence commenced earlier".

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

At 1811 GMT the train initiated the crossing sequence for the Ufton crossing.

BBC: NEWS | UK | At-a-glance: HSE Ufton Nervet report

For the most dangerous scenes, including one involving a moving train, Cruise will film his sequence separately and be patched into the scene later.

FORBES: Entertainment

But I do wonder how easy it will be to get a research-level DNA sequence if sequencing manages to get on the medical reimbursement gravy train.

FORBES: Debating The $1,000 Genome