In August 2019 the BBC Shared Data Unit reported railway stations serving London's commuter belt remained a prime target for bike thieves.
Across Great Britain, theft of bicycles from station property rose from 4,500 in 2016-17 to 6,400 last year, a rise of around 42%.
Campaigners and victims said more investment was needed to reduce this "low-risk, high-reward crime".
The Department for Transport said it wanted to improve security and install more CCTV to keep bikes safe.
The BBC's Shared Data Unit analysed crime data from British Transport Police and footfall figures from the Office of Rail Regulation and Transport for London.
It found:
- Some 16,725 bikes had been stolen from 1,245 railway and London Underground stations from 2016-2019.
- Many of the stations with the most thefts were located in London and the South East
This piece of content was produced by a regional newspaper reporter working alongside BBC staff.
The Shared Data Unit makes data journalism available to news organisations across the media industry, as part of a partnership between the BBC and the News Media Association. Stories generated by the partnership included:
- The Yorkshire Post: The Yorkshire railway stations that are gold mines for bike thieves 5 August 2019
- The Gazette: These are the train stations with the most bicycle thefts 5 August 2019
- The Northern Echo: Bike thefts from railway stations in region have doubled 5 August 2019
- Dorset Echo: Surge in thefts of bicycles from Dorset railway stations 5 August 2019
- Bury Free Press: Thieves snatch fewer than 40 bicycles from train stations in three years 5 August 2019
- The Welwyn Hatfield Times: Hatfield station among UK's best for bike thieves 5 August 2019
- Kent Online: Bike thefts from railway stations in Kent risen by more than a third 5 August 2019
- Stevenage: The Comet: Stevenage and Hitchin stations among UK's best for bike thieves 5 August 2019
- Stroud News & Journal: These are the train stations with the most bicycle thefts 5 August 2019
- Eagle Radio: Surrey and Hampshire train station bike theft hot spots 5 August 2019
- Cambridgeshire Live: Revealed: The Cambridgeshire train stations being targeted by bike thieves 5 August 2019
- Royston Crow: Royston, Cambridge and Shepreth stations among the safest for bikes in the UK 5 August 2019
- The Herts Advertiser: St Albans station has more bike thefts than any other in the UK 5 August 2019
- St Albans & Harpenden Review: St Albans tops list of bike thefts at UK stations 5 August 2019
- Ipswich Star: REVEALED: Scale of bike thefts from railway stations in Suffolk and Essex 5 August 2019
- Lancs Live: Leyland and Lancaster named as worst stations for bike thefts in Lancashire 5 August 2019
- Wilts and Gloucestershire Standard: These are the train stations with the most bicycle thefts 5 August 2019
- Romford Recorder: Cyclist calls for more attention to be paid to bike crime following thefts at Upminster Station 5 August 2019
- road.cc: Great Britain's worst railway station for cycle theft named 5 August 2019
- Hampshire: The News: Hampshire police deny organised gang of criminals is responsible for bike theft crisis at railway stations 6 August 2019
- Chichester Observer: Shock as train stations in Fareham and Fratton among the worst for bike thefts in UK 6 August 2019
- Daily Echo: Christchurch Railway Station among worst in country for bike theft 6 August 2019
- Express & Star: Nearly 1,000 bikes stolen from Midlands train stations 6 August 2019
- York: The Press: 33 per cent rise in bike thefts at York Station 6 August 2019
- YorkMix: Cycle thefts at York Station up by a third 6 August 2019
- West Sussex Gazette: Chichester railway station ‘among worst in country for bike thefts’ 6 August 2019
- Portsmouth: The News: Shock as train stations in Fareham and Fratton among the worst for bike thefts in UK 6 August 2019
- Bedford Independent: Bedford station has second highest number of bike thefts in the country 7 August 2019
- This Is Wiltshire: Huge rise in bicycle thefts from station 8 August 2019
- Watford Observer: St Albans City tops list of bike thefts at train stations 8 August 2019
- Maidenhead Advertiser: Bike theft figures at Maidenhead station disputed 9 August 2019
The story was also used by Look North (East Yorkshire and Lincolnshire), BBC Coventry & Warwickshire, BBC Radio Cornwall, BBC Radio Lancashire, BBC Radio Lincolnshire, BBC Surrey, BBC Radio Cambridgeshire, BBC Hereford & Worcester, BBC Sussex, BBC Radio Oxford, BBC Berkshire, BBC Wiltshire and BBC Radio Kent
- Video: Tips of how to keep your bike safe at train stations and ways of locking it securely
- Bar chart: Railway stations with the most bicycle thefts
- Bar chart: Railway stations with most thefts per passenger