We asked our readers to send in their best pictures on the theme of "railways". Here is a selection of the photographs we received from around the world.
Neil Armstrong
Neil Armstrong: "Class A1 Stroudley Terrier 0-6-0T No. 72 'Fenchurch' steams up on a rainy day in June. About to set off from Sheffield Park station to East Grinstead on the Bluebell Railway in East Sussex. I was planning a day's lineside photography - but took these of the first service out on the day from the dry shelter of the platform."
Sally R Kent
Sally R Kent: "The red commuter train makes its first crossing of the day over the famous Nine Arch Bridge in Kandy, Sri Lanka."
Norman Rigby
Norman Rigby: "Three Generations on Steam. Taken at West Lancs Light Railway project, Tarleton. Volunteers restore and maintain vintage engines and run them on their own narrow gauge track."
Mark Norrington
Mark Norrington: "The Albula line in the Swiss alps between Chur and St Moritz."
Rick Woodward
Rick Woodward: "A steamy evening at Didcot engine shed."
Matthew Logan
Matthew Logan: "This freight train was a blur as it passed through Patapsco Valley State Park in Ellicott City, Maryland."
Caroline McIlvenny
Caroline McIlvenny: "Trains from abandoned copper mines in Lefke in Northern Cyprus. Once a thriving industry with railway running to the port for transportation, but now just abandoned."
Mark Cable
Mark Cable: "Forgotten Platform. A former railway station between Durham and Bishop Auckland."
Mervyn Edwards
Mervyn Edwards: "The Flying Scotsman on the Watercress Line pulling out of Alresford."
Colin Whitton
Colin Whitton: "Ready for the off at the Strathspey Steam Railway."
Bryan Ellis
Bryan Ellis: "A cross country HST at Bristol Temple Meads."
Howie Fletcher
Howie Fletcher: "Taken on the station at Porthmadog as the train was preparing to leave the station for Blaenau Ffestiniog."
John Barry
John Barry: "On the footplate of the North York Moors Railway, Grosmont Station."
Martin Price
Martin Price: "Sir Nigel Gresley crossing Aisgill viaduct on the Settle to Carlisle railway."
Allan Stewart
Allan Stewart: "Durango to Silverton Railroad carving its way through the Colorado Rockies."
Jan Shorrock
Jan Shorrock: "The Jacobite Steam Train crossing the Glenfinnan Viaduct."
Chris Parry
Chris Parry: "Ffestiniog Railway train arriving back at Porthmadog Harbour underneath a rainbow."
Doris Enders
Doris Enders: "A wooden toy train."
The next theme is "arches" and the deadline for entries is 1 October 2024.
The pictures will be published later that week and you will be able to find them, along with other galleries, on the In Pictures section of the BBC News website.
Neil Armstrong
Sally R Kent
Norman Rigby
Mark Norrington
Rick Woodward
Matthew Logan
Caroline McIlvenny 
Mark Cable
Mervyn Edwards
Colin Whitton
Bryan Ellis 
Howie Fletcher
John Barry
Martin Price
Allan Stewart
Jan Shorrock
Chris Parry
Doris Enders