Did the Hogwarts' Express take a detour in Harry Potter and the Prisoner of Azkaban to pick up the Dementors?
Yesterday, I listened to the German audio book and there Ron complains that it takes pretty long to arrive at Hogwarts.
When the train stops to pick up the Dementors, the three think that they actually are at Hogwarts, so the time to get to the pick up place is roughly the same as the time to get to Hogwarts.
It could also be, that the train had to go slower because there was some heavy raining going on.
Is there any source gives some explanation about this passage?
The rain thickened as the train sped yet farther north; the windows were now a solid, shimmering gray, which graduily darkened until lanterns flickered into life all along the corridors and over the luggage racks. The train rattled, the rain hammered, the ind roared, but still, Professor Lupin slept.
“We must be nearly there,” said Ron, leaning forward to look past Professor Lupin at the now completely black window.
The words had hardly left him when the train started to slow down. “Great,” said Ron, getting up and walking carefully past Professor Lupin to try and see outside. “I’m starving. I want to get to the feast…”
Prisoner of Azkaban, chapter 5 (The Dementor)