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How did George Westinghouse contribute to railroad transportation?

A. His invention of air brakes made railroad travel safer and faster.
B. His development of the sleeping car made railroad travel much more comfortable.
C. His invention of the steam engine made railroad travel faster and more affordable.
D. His creation of a railroad network helped make railroad travel more efficient.

A. His invention of air brakes made railroad travel safer and faster.

Explanation: Westinghouse was a prolific inventor who also invented the air brake which made railroad travel safer & faster.

Explanation:

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lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

explanation: