A Treatise on Wooden Trestle Bridges and Their Concrete Substitutes According to the Present Practice on American Railroads
Abstract
IN the present edition of this work, which was first published in 1891, will be found a very full account of the construction, erection, maintenance, and preservation of timber trestle bridges. The book is profusely illustrated, and contains working drawings showing the details of the standard trestles used on the principal American railroads. Wooden trestles may be disappearing gradually from main lines of heavy traffic, but the increased growth of branch lines, or feeders, and of trestles at manufacturing plants and for electric railways, have probably more than kept pace with its abandonment on main lines. There is. on the average, about 100 ft. of bridges and trestles to each mile of railroad in the United States. The wearing out of wooden trestles and the increasing cost and scarcity of timber suitable for their replacement has taxed the ingenuity of railroad officials to find suitable structures to take their place. In some cases iron or steel structures have been employed, but there are numerous districts where local conditions make these methods so expensive as to be prohibitive.
A Treatise on Wooden Trestle Bridges and their Concrete Substitutes.
By Wolcott C. Foster. Fourth revised and enlarged edition.
