The bodies of the three men, aged in their 20s, were found near Loughborough Station, South London – a known graffiti hotspot.
Police are now investigating whether the men had been sneaking onto the tracks in the middle of the night, with spray cans having been found near the bodies.
Investigating officers were also seen taking photos of graffiti at the tracks – probing the street art as a possible "line of enquiry" into the "unexplained" deaths.
The investigation comes as fears mount the men could have been killed by a freight train in the early hours of this morning, found hours later at 7.30am.
British Transport Police has not confirmed if the group were graffiti artists, but Superintendent Matt Allingham, BTP, said: "The bodies were discovered by a train driver.
"We know that they were dead for a while before we turned up.
"It was a possibility that it was during the hours of darkness – that's why it wasn't reported early on.
"We are still trying to identify the train that hit the individuals."
He added the layout of the tracks meant there wouldn't have been anywhere for them to go if a train came.
He said "If someone was on those tracks there's nowhere they could go to avoid the train.
"They wouldn't have had much options."
Supt Matt Allingham earlier said: "We are aware that there are a number of speculative comments about this [the group being graffiti artists] on social media, but it is too early for us to comment on their reasons for being on the track."
Police are also trying to figure out which train could have hit the men, with the track busy with rush hour trains and freight train convoys.
Police are now in the process of formally identifying the victims, with the family of one of the men already told the tragic news.
Speaking this afternoon, Supt Allingham said: "Officers have delivered the sad news to one family that we believe one of the men was their son. We are still working to identify and locate the next of kin for the other two men.
"Whilst investigations continue, our focus is on supporting those bereaved families at this difficult time and gathering as much evidence as we can."
Supt Allingham asked for anyone who knew the men to come forward to help them with their inquiries.
Police are also appealing for anyone with information or footage to come forward.
Supt Allingham said: "If you were in the area of Loughborough Junction this morning and think you saw anything that could help the investigation, please get in touch with us as soon as you can."
It is understood the bodies had been seen a few hundred metres from Brixton overground station.
The bodies were found on a section of railway beyond a station, on a part of the track that goes over some arches.
The South London station is still open but services through the area have been delayed.
London Mayor Sadiq Khan said: "My heart goes out to the families of the three people killed at Loughborough Junction station this morning.
"We are in close contact with British Transport Police who are urgently investigating this incident."
The tracks – where the three were found – and platform are raised above ground on a viaduct.
A London Ambulance Service spokesperson said: "We sent a number of ambulance crews but sadly three people were found dead at the scene."
Loughborough Junction station is served by Thameslink trains and is between Herne Hill and Elephant and Castle.
Train services are delayed and passengers have been urged to check Network Rail for updates.
Information can be passed to BTP by sending a text to 61016 or by calling 0800 40 50 40 quoting reference 93 of 18/06/2018.
More to follow…
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