Cutting Edge Technologies (1984) / Chapter Skim
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Introduction
Introduction
Pages 135-137
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From page 135... ...
The current technological systems supporting this vast transportation network reflect nearly 100 years of progress, much of which has occurred in the last 50 years. Today, increasingly, technological innovation must be responsive to social, economic, and political pressures if it is to be effective.
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From page 136... ...
In the New World the Mayans constructed roads that had a base of broken limestone with stone sizes decreasing upward, covered with a mortar of lime and sifted earth. The scarcity of timber in the southwestern United States and regions of Central and South America led to exploitation of local stones and soils, resulting in the familiar adobe brick, strengthened as necessary with sticks and reeds.
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From page 137... ...
However, with the gradual development of the truck and waterway modes of transportation and the completion of the interstate system of highways, the railroads were suddenly confronted by a vigorous economic challenge. The railroad industry has responded with the adoption of new technologies to force safety improvements and efficiencies in rail transportation.
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