Which famous transportation product was originally rejected by railroad companies before becoming one of the most revolutionary inventions in freight transportation?

Test your knowledge of iconic transportation products that revolutionized the way we move! The transportation industry has given us numerous groundbreaking products that have changed our lives forever. Some have fascinating origin stories that might surprise you. Can you identify the correct origin story of these famous transportation innovations? This poll challenges you to separate transportation history fact from fiction.

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The shipping container (invented by Malcolm McLean), initially dismissed as impractical until it reduced loading costs by over 90%
The pneumatic tire (invented by John Dunlop), initially considered too bouncy and unstable for railroad applications
The diesel engine (invented by Rudolf Diesel), rejected as too expensive and complicated compared to steam power
The air brake system (invented by George Westinghouse), initially considered unnecessary as manual brakes were the industry standard