It forms part of an investigation by the British Transport Police (BTP) into an incident on August 14 at Wandsworth Road Railway station.
Between the hours of 4.10pm and 5.40pm, a male trespassed across the tracks.
The result saw significant delays to services, which cost the railway network hundreds of thousands of pounds.
The BTP has now released an image of a man they wish to speak to in connection to the incident, who they believe could have information to help the investigation.
PC Thomas Appleton said: “We would like to speak to the man in the image, as he may have information that could help our investigation.
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“While we appreciate the images may not show the clearest picture of the man, someone may recognise their clothing or notice something distinct.”
If you recognise him, or have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 481 of August 14.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
