A 12-year-old boy is in a critical condition in hospital after suffering severe electrical burns on railway lines near Doncaster.
The schoolboy was injured close to South Elmsall on Monday evening.
The British Transport police said officers and paramedics were called after reports of a person on the tracks just before 6.15pm.
Officers are believed to be investigating claims that a group of children were playing on a bridge before one fell on to the tracks.
A spokesman for the British Transport police said an investigation had been launched into how the boy came to be on the line.
The force said: “We attended alongside paramedics and a 12-year-old boy was treated by paramedics for serious electrical burns. He was taken to hospital where he remains in a critical condition.”
Rail passengers experienced long delays to the busy rush-hour service between Leeds and Sheffield.
Anyone with any information is asked to contact the British Transport police by sending a text to 61016 or by calling 0800 40 50 40 and quoting 412 of 03/10/2016.
