These pictures show the terrifying moment that a mother walked two young children, including one in a pram, across a live railway line.
It appears as though the mother, who police are trying to find, crossed the lines while taking a short cut.
She pushes one child in a buggy along the live tracks - while a toddler appears behind her, just feet away from where trains pass at a busy junction in Pitsea, Essex.
The British Transport Police has released CCTV images of the family in a bid to alert people to the dangers of trespassing on the railways.
A spokesperson from the BTP said: "We don't know what this woman was doing, but the only reason we can think that she would take two small children across a railway is because she was following a short cut.
"People don't realise that walking along a train track is just as dangerous as walking down the middle of a motorway."