While the Hogwart's will pull five or six cars, don't kid yourself about the longevity. I've replaced a bunch of those small flat-sided set motors in starter sets, and the Hogwart's locomotive is about the heaviest one I've ever seen that uses the small motor.
I took a second locomotive and had Frank Timko install a properly sized motor in it, it will replace my small motored model.
Re-motoring the Hogwart's Express
Here's the re-motored locomotive chassis, this will eventually be what is in front of my Hogwart's cars.
