Since dwemer technology can be used to justify any crazy modern-era invention around, why stop at trains? Why not just hop in the dwemer-mobile? Or take to the skies in dwemer-copter or dwemer-wing?
The Dovahkiin can be like a dwemer-powered Bruce Wayne, secretly living a hidden life in the dwemer cave, where he uses lost technology to fight crime (and illegal dragons)!
How is the need for transportation of goods and people between settlements coupled with the accessibility of steam powered engines anything like a Dwemer powered Bruce Wayne?
Answer: its is not, it is overexageration into the ridiculous.
A Dwemer railroad would be a nice little touch in the game, especially if the tracks are largely missing and buried and there is no way at all to actually ride on it.
Furthermore, while it wont be in the vanilla game I think that a mod that introduces an ancient fast travel system akin to the propylon system in Morrowind, but Dwemer in nature would fit quite well.
Dwemer airships, Dwemer (underground) railroads, that kind of thing.
This irrational bashing of any idea that even touches on the subject is a little too zealoty for my taste.
Why not try and see an idea for its merits instead of shouting 'witch! witch!' and starting a pyre.