With forty-nine people killed last year taking short cuts across railway lines, Network Rail has enlisted Welsh 400m hurdles champion Dai Greene to warn of the risks.
Greene appears in an video as part of a campaign called 'Track Tests'. He is shown struggling to run along tracks due to rain, grease on the line and other hazards, to illustrate that if a fit, agile athlete is unable to get out of the way of a train, then others will not have a chance.
"On the running track it's important that my reactions are lightning fast but on the train track that didn't count for much" he said.
"The experience has brought to life just how many dangers there are on the rail tracks - most of which I knew nothing about".
More top news
Welsh Police forces say they are calling for young drivers to "change driving behaviours" to stop approximately 30 deaths a year.
The Secretary of State for Wales says links between the Welsh and English economies will be strengthened when the Severn Tolls are scrapped.
Swansea boss Carvalhal targets Liverpool upset in 'David and Goliath' battle