How do I make a good-looking town then?
My suggestions on this:
1) Decide the virtual population of the town you want to build. This is important because a town of 100 has different characteristics than a town of a 1000, and both have different characteristics than a town of 10,000, and all are different from a town of 100,000. Also decide the part of the country in which your town is to be located
2) Find real towns of the size you want to model in the part of the country you prefer and use one of the the various map sites, and do image searches on the name of the town to find images of the town on line, and use street view (if available) to take a virtual tour of the town. Study the characteristics of the size town you wish to build. For example, in a very small town, most of the streets, expecially in residential neighborhoods, will have ditches, and there will be few curbs an sidewalks; very large communities will have mostly curbs with sidewalks, and very few, if any, streets where drainage consists of ditches. Building designs will vary slightly by the part of the country in which they are built. Old houses in the Southern US tend to have less pitch in the roof, than a house with the same floorplan in more Northerly climes.
3) Use the satellite view in one of the map sites, and scale the view as closely as you can so that a screen shot contains 720 x 720 meters (size of a Trainz baseboard), take a screenshot, use image processing software to trim the image so that it is one baseboard, and use that screenshot as a template to make your town.
4) Smaller towns will tend to have more variety in residential structures than larger ones, as most, if not all, of the residences were built as "one-offs", while larger communities will have neighborhoods where the same few designs were used in a rather larger number of homes. Smaller towns may also tend to have more old buildings than larger ones.
Creating a good looking town is a skill, and like any other skill, improves with practice. Take a board, lay down a length of track, and go to creating a town, and see what works. As soon as you find that it doesn't look like it works, take a moment and analyze it to find out what looks wrong, and fix it. You might also visit your local library, and look for books on planning towns, and land use.
ns