It's in the middle of platform 9 and platform 10. The wizards had to had some way to get from the regular world to the magical train, and there had to be a way that Muggles didn't see it or suspect anything, and it didn't interfere with their stuff.
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It is never stated.
Harry potter leaves from platform 9 and 3/4s. He and his Hogwart's companions get to this by running through a brick wall between platform 9 and 10. In the second book, the Chamber of Secrets, Ron Weasley and Harry run at the wall, only to find that it has been sealed off. Their excuse to the muggle station officer who comes to them looking very worried is ' sorry, couldn't control the trolly.'
Hogwarts
KINGS CROSS STATIONand to some extent Platform 9 3/4There is a belief that Boadicea was buried between platforms 9 and 10 in King's Cross station in London, England. There is no evidence for this and it is probably a post World War II invention.And Harry Potter leaves for Hogwarts from platform 9 3/4 in Kings Cross station
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