Q. Which is an invention that improved safety for railway passengers?
A) Refrigerated rail cars
B) Air brakes
C) Pullman sleeping cars
D) Time standardization
✔ Correct Answer: Air brakes
Exam Insight
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A) Refrigerated rail cars
B) Air brakes
C) Pullman sleeping cars
D) Time standardization
✔ Correct Answer: Air brakes
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