Which of the following was not among the technological improvements that made the modern transcontinental railroad network possible?

Question

Quizplus · Accepted Answer

The caboose was not a technological improvement that made the modern transcontinental railroad network possible. It was a car at the end of a train used by the conductor and crew as an office and living quarters, but it did not play a crucial role in the functioning of the railroad network. Steel rails, air brakes, standard gauge tracks, and the block signal were all key technological advancements that made the transcontinental railroad network more efficient and safer.

Which of the Following Was Not Among the Technological Improvements