Onde as outras plataformas levam?

Dumbledore smiled at him. ‘We are in King’s Cross, you say? I think that if you decided not to go back, you would be able to ... let’s say ... board a train.’

‘And where would it take me?’

‘On,’ said Dumbledore simply.

Deathly Hallows - page 578 - UK - chapter 35, King's Cross

Talvez as plataformas ¼ e ½ simplesmente conduzam On . . . onde e o que quer que seja On pode ser!

On é apenas uma ideia. :)

ETA: Isso continuou me incomodando, então eu entrei no Pottermore e verifiquei as informações na Plataforma 9¾. . . e eu encontrei algo. A JKR percebeu outros trens saindo de outras plataformas fracionadas. Ela achava que um poderia ser como o Expresso do Oriente, enquanto outros seriam usados em ocasiões especiais para levar bruxas e bruxos a eventos pontuais, como um concerto (ou talvez até mesmo um zoológico de criaturas mágicas ou circo!)

Sayeth Você-Sabe-Quem:

In choosing the number of the concealed platform that would take young witches and wizards to boarding school, I decided that it would have to be a number between those of the Muggle platforms - therefore, it was clearly a fraction. This raised the interesting question of how many other fractional platforms lay between the whole-numbered platforms at King's Cross, and I concluded that were probably quite a few. Although these are never mentioned in the book, I like to think that it is possible to take a version of the Orient Express off to wizard-only villages in continental Europe (try platform seven and a half), and that other platforms may be opened on an as-required-basis, for instance for large, one-off events such as Celestina Warbeck concerts (see your ticket for details).

_{The number nine and three-quarters presented itself without much conscious thought, and I liked it so much that I took it at once. It is the 'three-quarters' that makes it, of course.}

[J.K. ROWLING - POTTERMORE - PLATFORM 9¾]

Plataforma 7 1/2 é o Expresso do Oriente