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Which is an invention that improved safety for railway passengers?

refrigerated rail cars
Pullman sleeping cars
time standardization
air brakes

2 Answers

4 votes

Answer:

answer is D

Step-by-step explanation:

answered
User Atiana
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4 votes
It was the invention of time standardization that improved safety for railway passengers, since this in many ways led to far fewer train collisions, which were an issue.