This is an excellent introduction to Track Design. Point-to-Point Layouts, Continuous Running, Out-and-Back Layouts, Terminal Railroads, Short Line Railroads, Corridor Railroads, Multi-track main lines, Combining Various Designs, Layouts for Odd Shapes, and Layouts on a 4 x 8 sheet of plywood.
This really isn't the complete book on the subject but all ideas and plans are welcome in the design of a model railroad. From the pages of Railroad Model Craftsman.
Carstens Publications, softcover, 72 pages, standard portrait book 8 x 10 in., B&W photographs; illustrations and plans.