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Cheaper rust-resistant steel let engineers make heavier and stronger:
ARail lines
BRain drains
CRoof tiles
DRope coils
Answer & Solution
Correct answer: A. Rail lines
1. Railways carried ever heavier loads as industry grew.
2. Iron track could not take that weight for long.
3. Steel made stronger rail lines possible.
_Source: OpenStax World History Volume 2, Chapter 9, The Second Industrial Revolution._
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