Jack Gilbert and Harrison Scott-Hood, 23, and Alberto Fresneda-Carrasco, 19, were found dead on the tracks near Loughborough Junction station, near Brixton, on Monday morning.
It is believed they were hit by a freight train while painting graffiti in the early hours of the morning.
The parents of Mr Scott-Hood described him as a beauitful artist and loved by everyone… an intelligent and wonderful boy who had so many close friends.
Mr Carrasco, a Spanish-American living in north London, was hoping to study graphic design at the London College of Communication in September, and was keen on fashion.
His family said he left home at 5pm on Sunday and later sent a message that he would head home – but he never returned.
They said his absence had left a deep hole in the family.
RIP kbag lover trip
A post shared by Allcity (@ukfrontline) on Jun 19, 2018 at 449am PDT
The UKFrontline Instagram page, which showcases the work of graffiti artists in the UK, showed photographs of the men’s tags – Kbag, Lover and Trip – painted on a railway bridge and on boarded up stores.
Other graffiti artists paid tribute, writing too young too soon and rest in paint alongside images of the men’s work.
A photograph showed one of the men spraying on a building, another an image of the words don’t play on the track – its not a game painted on a train.
Stay safe people, it’s not a game
A post shared by Allcity (@ukfrontline) on Jun 18, 2018 at 656am PDT
Much of the discussion on social media considered the dangers of painting on train tracks, and safety measures that artists could use to avoid being hurt while tagging.
Flowers and three spray cans lay next to shutters at Loughborough Junction on Tuesday morning, which was painted with the word RIP and three hearts.
News Source SkyNews