Children have been caught playing on railway lines across Scotland, the British Transport Police said.
They were found on train tracks near Port Elphinstone, Inverurie and Boat of Kintore in Aberdeenshire.
British Transport Police said there had been several other incidents of trespassing on the railways as it issued a warning ahead of the school Easter holidays.
Inspector Bryan O’Neill said: “The railway is full of hidden dangers. Too many times we have seen the tragic consequences of young people ignoring the warnings about trespassing on the railway and taking risks that have resulted in terrible injuries or death.
“So it’s vital that parents play their part and ensure they know where their children are and what they are up to.
“Passengers continue to be our eyes and ears and they can help us by reporting crimes and concerns by texting 61016.”
Mark Henderson, Network Rail senior community engagement manager, said: “Trespassing on the railway can result in life-changing or even fatal injuries.
“We work closely with the British Transport Police to educate young people about the dangers on the railway and would urge the public to keep well off the tracks.”