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Hello Sledgewrt and welcome to the forum.
I don't know your area very well but could it be that the normal route via Swanley closes for maintenance each night and that's why the last train is routed via Dartford?
Another possible reason for this unusual routing is that it helps to keep the route knowledge of drivers up to date should they need to use the Dartford line as a diversion route.
We have some drivers on the forum and hopefully one of them might be able to come up with the definitive answer.
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