The accident happened at Wimbledon station, according to reports.

Maynard, born in Cardiff and hailing from a strong cricketing family, played 48 first class matches and his last game was a FLt20 game against Kent on Sunday.

His father, Matthew Maynard, played four Tests and 14 ODI's for England in the early 1990's, and is South African franchise Titans' coach.

Surrey Chairman Richard Thompson said in a statement: "Our thoughts at this awful time are with Tom's family and friends and all those that were close to him.

"Tom Maynard was a prodigiously talented young batsman who had made an incredible start to his career and was clearly destined for far greater things.

"The impact Tom made in such a short period of time for Surrey CCC spoke for itself. There is a profound sense of loss at the passing of Tom. To lose anybody at such a young age is an utterly senseless tragedy."

ECB Chairman Giles Clarke added: "This is a very sad day for everyone connected with Surrey County Cricket club and for Glamorgan County Cricket club where Tom spent the early part of his career.

"Tom was a player of enormous potential who had already represented England Lions and had an exciting future ahead of him.

"Our hearts go out to the Maynard family for their tragic loss and we send them and all Tom's many friends and colleagues within the game our deepest sympathies."

Surrey's T20 game against Hampshire, scheduled for Wednesday, has been postponed.