Because steam engines were so ridiculously heavy, in order to harness their power for use in transportation, the weight of the engine had to be distributed on the ground over a large area to avoid sinking/getting stuck. The engine was, therefore, to be placed on _ and crossties.

Rails im thinking

Explanation:

im a locomotive expert i volunteer on a crew that maintains a steamer.

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

hope this !