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He worked with locomotive designers to ensure the trains would run smoothly on his tracks.

Explanation:

George Stephenson is known as father of railway and designed the first locomotive train called Blücher in 1814.

George Stephenson first made flanged wheel locomotive that can carry 30 tons of coal but faced lot of issues regarding the weight carrying by the rail and that was damaging the cast-iron rail tracks. Then he worked with locomotive designers and distributed weight by using numbers of wheels and run them on  his tracks.

This is how trains with number of wheel formed by the contribution of George Stephenson.

Hence, the correct answer is "B."

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