There are thousands of websites related to model railroading. Many model railroad clubs have websites that describe their railroad and building techniques. Model railroad magazines list upcoming shows and club tours you can attend to see model railroads in action. I have never met a model railroader at a show, or club, who was not more than happy to show me and describe to me how he or she designed and built a project. Model railroaders are friendly and eager to help other model railroaders and the public.
Many model railroaders are, or become, prototype railfans, too.
Not all trains, locomotives, and freight cars look alike. Modelers and railfans often take photos and videotape of trains and railroad operations to use while designing and building their layouts. Some railfans carry radio scanners while watching and looking for trains so they can better prepare their camera location for approaching trains. Railroad magazines are also a good source for railroad photographs and information. On the Internet, there are thousands of railfan railroad news sites, photo sites, corporate sites, and very active discussion boards.