Question

Which raw materials had to be shipped to the construction sites in large quantities because they were essential for building the railroad tracks?

Answer 1

It was necessary to have large quantities of steel shipped long distances in order to form the railroads.

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Answer 2

Wood and Iron

Step-by-step explanation:

To built railroad tracks it is required to obtain woods from forests for the wooden rail ties. Wooden ties (sleepers) were used in tracks to hold long iron tracks in its place when a train moves above it. Historically, wooden ties used at the beginning of railroad expansion, which shipped from forest areas to the construction sites. Iron placed an important in building the tracks because of its quality of being very strong, holding weight, and resisting heat.