Which best describes the impact of railroad expansion on the steel industry?
it did not affect the demand for steel at all.
it decreased the demand for steel since railroad tracks were built from wood.
it increased the demand for steel since steel was used to make railcars and tracks.
it decreased the demand for steel since the railroad was generally not used to transport steel.

The option which best describes the impact of railroad expansion on the steel industry is OPTION C. The correct answer is C. Steel is an alloy of several metals with unique properties. It is durable, it has good yield and tensile strength and possess thermal conductivity. These features make it a good choice as a constructive material for railroad track. The demand for steel increased dramatically when it was recognized as a good material for building railroad tracks.