The lightning train illo made me flinch the first time I saw it, but going through the book, it not only makes sense, it has restrictions and difficulties that ensure it will serve equally well as a source of plot hooks as for a convienient "red line drawing across the map" depending on how the DM wants to use it in his game.
As someone writing for the line, I've also been told pretty much point blank - "no magical toasters!" The prevalence of low level magic for comercial use is tied to an intriguing aspect of the setting, and will be clearly a feature of Eberron, rather than some random colision of outside sources. And again, it makes sense rather than being a cheesy mess that such an idea could have been.