The Model Railroader's Guide to Bridges & Trestles - Jeff Wilson - Bog

"Bridges and trestles are focal points for photographers on prototype railroads, and they are likewise key scenic elements (and photo subjects) on many model railroads. Modeling them in a prototypical manner is important to capture realism. This book covers the history of various types of bridges (stone and concrete arch, truss, cantilever, plate-girder, wood trestle, and various types of culverts), how they evolved in terms of design and size, and explains how railroads choose the appropriate type of bridge to fit each situation. The book also looks at piers and abutments and shows how bridges fit in with other related scenic elements (fills, retaining walls, hills, valleys, waterways, highways, other railroads, etc.) and provides information on moving bridges such as bascules, swing bridges, and lift bridges"--