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
There'll be a mixture of sunshine and wintry showers, staying windy with some rain in the afternoon.
A 50-year-old capuchin monkey who was originally rescued from Wales has found new love after her long-term partner died.
The UK Government has published an updated shortlist of sites to launch commercial spaceflights, with Llanbedr still in the running.