22 year old Dino Donaldson was found guilty of murdering 21 year old Anojan Gnaneswaran in 2024.
Donaldson has been sentenced to life with a minimum term of 23 years in jail at Old Bailey.
He chased the victim on to the tracks and stabbed him in the chest, abdomen and thigh during the attack.
The fight broke out on the platform between two groups of men over a drug deal worth £50 for 10 MDMA tablets.
Mr Gnaneswaran was pronounced dead at the scene.
Judge Angela Rafferty KC sentenced him at the Old Bailey.
BTP Detective Chief Inspector Paul Attwell said: “What started as an argument over a drug deal ended in a young man’s future being stolen from him by a remorseless criminal.
“Donaldson showed his true colours as a coward by arming himself with a knife that night. His cowardice has continued by never accepting responsibility and admitting his crime – thankfully the jury saw through his lies.
“He will live the rest of his life knowing he has taken someone else’s, and he deserves every minute of his 23-year minimum sentence.
“Anojan’s family have been left with an unfillable void in their lives after their talented son and brother was taken from them in the most brutal circumstances imaginable.
“I want to pay tribute to them all, for the strength, dignity and patience they’ve shown throughout this case.”
Anojan’s family previously paid tribute to their “much-loved son and brother”.
They said: “Anojan was in his third year at university studying accounting and finance, and he was so excited for his future.
“He excelled at all sports and had achieved first-dan black belt in karate – he competed in the World and European championships in karate, and we will all miss him so much.”
