Traken was the homeworld of the Trakenites, a race of pacifists, and the capitol of the Traken Union. Its many plants required much care, a duty that was carried out by the Fosters.
The planet was in the system Mettula Orionsis and was watched over by the Keeper of Traken. It was said that there was so much good in the air that evil would just shrivel up and die.
The Doctor's companion, Nyssa, was a native of Traken. (TV: The Keeper of Traken)
Traken once had a monarchic system of government. (PROSE: The Immortals)
The Fifth Doctor took Nyssa to Traken in its primeval age (circa 1000 BC) to cure her of an illness, as all diseases had been eradicated on the planet by her native time. (AUDIO: Primeval)
The Second Doctor visited Traken with Jamie McCrimmon and Victoria Waterfield. (PROSE: The Astronomer's Apprentice)
In 1981, whilst travelling to Earth from Logopolis in the Fourth Doctor's TARDIS, Adric and Nyssa witnessed Traken and Mettula Orionsis being destroyed by a wave of entropy. (TV: Logopolis)
There were no zoos on Traken. (AUDIO: Smoke and Mirrors)
Theatre also existed on Traken. (AUDIO: The King of the Dead)
Television existed on Traken, but it never became a popular form of entertainment. (PROSE: Not So Much a Programme, More a Way of Life)
Satona chlorensis was a flower which grew on Traken. (AUDIO: The Toy)
Nyssa told the Fifth Doctor that the forests on Vortis reminded her of those on Traken. (AUDIO: Return to the Web Planet)
When Nyssa told Andrew Harper that she was from Traken, he assumed that it was in Ireland.
There was a village in England with the same name, which was 40 minutes away from Stockbridge. (AUDIO: Autumn)