The iconic Flying Scotsman locomotive is set to arrive at London's Paddington Station as it embarks on the Cardiff Express journey. 

As part of its centenary year celebration, the most famous steam locomotive in the world will be making a number of journeys from the capital this year and will see it visit Wales, Scotland and Yorkshire. 

Today's (Wednesday, June 7) journey will see it head on a scenic rail journey through the Thames Valley on its way to Cardiff, and crowds are expected to gather to see the Flying Scotsman. 

However, organiser The Railway Touring Company have asked that any public heading to see the Flying Scotsman do so safely. 

Public told to not attempt to trespass to see Flying Scotsman

The Railway Touring Company and the National Railway Museum have shared that although they appreciate there is considerable interest in Flying Scotsman, they ask anyone wishing to see it on the route to do it from a safe and permitted place. 

They warned that you should not trespass along rail lines or into prohibited areas of railway stations which are dangerous.

To avoid overcrowding and trespassing, organisers have not published any details on the Flying Scotsman's journey times.

Speaking of the safety message, a Network Rail spokesperson said: "Seeing Flying Scotsman is an exciting event for many people and we want everyone to be able to enjoy the occasion, so we can’t stress enough how important it is to keep safe at the same time.

“It’s vital that you watch from a safe distance and don’t go on or near the tracks. Trespassing on the railway is incredibly dangerous and can have devastating consequences, as well as being illegal. You could face a fine of up to £1,000 and be left with a criminal record.

“Please remember to watch from a distance and behave responsibly so that everyone is able to safely enjoy the sight of the historic locomotive.” 

The Flying Scotsman will also be visiting London's Euston station on Saturday, June 10.