I've managed to score some pretty good deals on plastic railroad buildings for use in our ATZ/Post Apoc games. The two cheapo brands I have tried so far are K-Line by Lionel and Plasticville by Bachman. Both of them make pretty good plastic kits, but there are some significant differences in the molded colors and playability right out of the box. I always leave the roof sections loose for playability and I cut the hold down pins to make the roof sections go on and off easier.
I'll post a few more buildings back on this thread as I finish them.
Two more K-Line kits, this time of warehouse/factory buildings. I like these. They have functioning doors in the back and some cool features like clear lights over some of the doorways. They are pretty sturdy, the roofs come off easy and they are fair sized for playing. If someone souped up the paint job they could be really nice. For now I will just play them.
Finally we come to a Plasticville set. This is the hobo shanty set, and I absolutely love it. Now, one thing about the Plasticville stuff, is that you absolutely better plan on painting it. The colors they are molded in are just horrible (yes even more so than my feeble attempts to touch them up!) I threw a quickie flat brown base coat on these, then just dry brushed and added some details. This was fast and rough work but they are already much more playable. Plasticville makes some great odd and different pieces but you will have to do some work.
Another Plasticville building, the roadside fruit stand. I love this building also. It has a cool scale and cash register and lots of produce to display. But, it is another one of those deals where you WILL be painting everything. I did a pretty shoddy job here but I still like it fine. I'll probably go back and put in a gravel floor later.