Originally posted by Dr Will Hatch
No it doesn't, it means that the SWG found more efficient and useful power sources. Magic doesn't interrupt certain tech, like the Hogwarts Express which runs on mechanics. If it only interrupts electricity, it means that it is illogical and perhaps based on the will of magic users.
Dude.....Hogwarts express:
http://harrypotter.wikia.com/wiki/Hogwarts_Express
In striking contrast to the rest of the British Rail system, the Hogwarts Express takes the form of a large red steam engine. It is a magical device, like the Ministry cars, the Knight Bus, and Wizarding Wireless Network. It borrows its form and its intended function from real steam trains, but not the technology.
The passenger carriages contain compartments set off a corridor, allowing each compartment to function as a self-contained stage within the larger train. During the long journey to Hogwarts, students may enjoy treats from a trolley, such as Pumpkin Pasties and Chocolate Frogs. There are usually no adults aboard the Hogwarts Express except the witch with the tea trolley and the driver, and possibly the fireman, who is needed to shovel coal into a locomotives boiler to keep it running. However, The Train would probably be bewitched to refuel itself. Occasionally new teachers (namely, Remus Lupin as well as Horace Slughorn can be found aboard the train as well.
So the SWG has more efficient energy sources, it's still energy, nothing changes there.