George Westinghouse: Identify his notable engineering invention. Full question: What did George Westinghouse invent? Choose the correct option.

Difficulty: Easy

Railway air brake
Incandescent light bulb
Phonograph
Diesel locomotive

Correct Answer: Railway air brake

Explanation:

Given data

Inventor: George Westinghouse (industrialist and engineer).

Concept / Approach
Westinghouse invented the railway air brake, transforming train safety. He also championed AC power systems via Westinghouse Electric, but his signature invention is the air brake.

Option analysis
Railway air brake — Correct. Light bulb — Associated with Edison/Swan. Phonograph — Edison. Diesel locomotive — Based on Rudolf Diesel's engine; not Westinghouse's invention.

Final Answer
Railway air brake.

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