Transportation on Land 



273 



TABLE OF ELEVATIONS AND GRADIENTS 



Exercise. Which of the railroads in this list reaches the highest 

 elevation? Which has the highest maximum grade? Locate on 

 railroad maps the summits of the transcontinental lines. What are 

 some of the chief objections to high elevation for freight traffic? For 

 passenger traffic? What advantages for passenger traffic are offered 

 by high elevation in the hot season of the year, as via the Santa Fe? 

 What advantages are afforded by the elevation, as via the Northern 

 railroads? What disadvantages in the winter season? 



The highest elevation reached by any railroad in the Western Hem- 

 isphere is that of the " Trans-Andean Railway " of South America- 

 What is its altitude? 



