There's a way.

I've been rereading the Harry Potter books. While reading the third book, a question popped up in my head.
"How do the teachers get to Hogwarts School?"

The Hogwarts Express was usually reserved for students and they had never seen an adult there before, except for the witch who pushed the food trolley.

In the third book, Professor Lupin got the train and helped Harry escape from being attacked by horrible creatures: Dementors. Anyone could feel Dementors, J.K.Rowling said. When you get depressed or feel feeble for no reason, they might be hanging around or standing behind you! I don't want them to drain my happiness and hope! When it comes to Professor Lupin, by the way, why did he get the Hogwarts train despite the fact that teachers rarely use it? Did he know what would happen to Harry in the train beforehand? Umm...