It sometimes amazes me how few people can read.
He said he intended to change the textures later. So what the first thing people yammer about: textures.
As for lighting, many wait till the end to add that, so I don't consider it a big deal, considering this level looks to be a decent ways from being finished.
As for what's done, interesting use of gothic arches, though you could probably enhance those with an appropriately made arch 3do to give a 3d feel to the arches. For a rail yard, it feels awfully enclosed, there's a lack in open space. A lot of the architecture you've put in doesn't seem to have any definite purpose or point. For the tower, if you're going to have X supports, you should frame them top and bottom, and make the support pillars smaller (those pillars are large enough that they should be able to support that structure on their own). The overhangs in the tower look nice, but they should be scaled back a bit. They give an overexaggerated look to the tower.
The level is boxy. For what you've described, it seems plain, clean, barren. Throw in some debris, pieces of thing around the place, crooked walls, something to liven it up, give it detail.
As for textures I'll try sending some your way to help you out.
_ _ _____________ _ _
Wolf Moon
Cast Your Spell On Me
Beware
The Woods At Night
The Wolf Has Come