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Adding a large proportion of manganese makes steel suitable for railroad rails because manganese:

1. imparts hardness to the steel
2. promotes formation of iron oxides
3. can remove oxygen and sulphur
4. can exhibit the highest oxidation state of +7

Correct answer: imparts hardness to the steel

Solution

High manganese content makes steel very hard and abrasion-resistant, which is the property needed for rails.

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