Railroad Homes
Scale model home for railroads is an important part of the set up for those with the hobby as it really makes the scene. For a home to be scale they need to be bigger than the train but smaller than the other buildings as it is naturally in most places.
The next thing that you should consider is the time period that you are setting up as it is more than just the homes but the style in which they are in depending on what type of scene you are creating.
After figuring out the time period you want the scene to appear with the train and have figured out the scale that you are running right now then you can work on getting the homes.

There are a few options as to getting the homes and the first is to find a local store but that won't work for everyone for several reasons. If you don't have a scale railroad store in your town or it is out of the price that you want to pay the next thing you can do is look online.
Online there are several things that you can do the first being the easiest which is to go online to store and order the homes that you like and need. The next option that can save you the most amount of money over time is that you can look online for train owners that want to sell their model homes for various reasons.
If you want to pick them up then narrow your search to local but if the sellers are willing to ship look all over the country and you are sure to find some that fit the bill for the size and what you want to have overall for the paper model railroad background buildings in your scene.