The parents of a student stabbed to death on a train in Cumbria have paid tribute to their "A-grade son".
Tom Grant was planning to join the Army when he graduated
Tom Grant, 19, from Churchdown in Gloucestershire, died on board a Virgin train travelling from Glasgow to Paignton, in Devon, on Saturday.
His parents, Kenny and Patricia, said he still had "so much to live for" and had been a "wonderful gift" to them.
A 21-year-old Lancashire man has appeared in court charged with Mr Grant's murder.
Mr Grant was on his way home from St Andrews University in Fife, where he was in the first year of a history and Arabic degree. He was planning to join the Army when he graduated.
In a statement released through British Transport Police, Mr and Mrs Grant said: "As a family we are deeply shocked and immeasurably saddened by the untimely death of our beloved only son.
"He was happily studying medieval history and Arabic at St Andrews University, having left Oakham School, Rutland, in summer 2005.
"He was especially active in the Oakham School Combined Cadet Force and successfully attended the Pre-Regular Commissioning Board at Sandhurst, with the hope of becoming an officer in the army, or possibly Royal Marines."
Mr and Mrs Grant said their son was a keen hill walker, a good sportsman and a Liverpool FC fan.
The train was travelling from Glasgow to Paignton in Devon
They added: "He had so much to live for. He was a wonderful gift to us, his parents.
"He has left us with vibrant memories and examples of how to give the most to life and other people, and we sincerely hope that all those with whom he came into contact were enriched, in however small a capacity, by his personality.
"We are working in close co-operation with British Transport Police and offer heartfelt thanks to their staff for the family support since Saturday's tragic event."
Friends described Mr Grant as a "popular, genuine guy" and his former headmaster said he had a "vivid personality".
Oakham School head teacher Dr Joseph Spence said: "All who study and work at Oakham School have been deeply saddened to hear of the tragic and violent death of Tom Grant.
"Tom had many friends and touched the lives of all his teachers and peers.
"He was a vivid personality and was a role model for younger pupils."
Thomas Lee Wood, from Skelmersdale, will appear at Carlisle Crown Court on 7 June for a preliminary hearing over Mr Grant's death.