which best describes a development that improved railroad safety?\nrailroads adopted standard time to…

which best describes a development that improved railroad safety?\nrailroads adopted standard time to coordinate schedules.\nrailroads offered fold - down beds so that people could sleep more comfortably.\ncompanies standardized track technology so that they could use each others tracks.\ncompanies replaced hand - operated brakes with air brakes on trains.

which best describes a development that improved railroad safety?\nrailroads adopted standard time to coordinate schedules.\nrailroads offered fold - down beds so that people could sleep more comfortably.\ncompanies standardized track technology so that they could use each others tracks.\ncompanies replaced hand - operated brakes with air brakes on trains.

Answer

Brief Explanations:

Adopting standard time coordinated schedules but not directly safety - related. Fold - down beds are for comfort. Standardizing track technology is about interoperability. Replacing hand - operated brakes with air brakes improves stopping ability and thus safety.

Answer:

Companies replaced hand - operated brakes with air brakes on trains.