Which best describes a development that improved railroad safety? Railroads adopted standard time to coordinate schedules.
Railroads offered fold-down beds so that people could sleep more comfortably.
Companies standardized track technology so that they could use each other’s tracks.
Companies replaced hand-operated brakes with air brakes on trains.

The answer should be: Companies replaced hand-operated brakes with air brakes on trains.

Explanation:

You have to think how hard it was for trains to stop with hand operated brakes. Trains go fast, and not stopping in time can be dangerous. Hope this helped :)

a

"the land of the dead"

the reform movements that arose during the antebellum period in america focused on specific issues: temperance, abolishing imprisonment for debt, pacifism, antislavery, abolishing capital punishment, amelioration of prison conditions (with prison's purpose reconceived as rehabilitation rather than punishment), the humane treatment of animals, the humane and just treatment of native americans, the establishment of public institutions for the care of the destitute, orphans, blind, and mentally ill, the establishment of public schools, the abolition of tobacco use, vegetarianism, health reform, homeopathic medicine, woman's rights (including, at first, especially the establishment of a woman's right to own property apart from her husband and her right to sue for divorce), and the amelioration of labor conditions (including higher pay, the right to form unions, the right to strike, and the demand for limits on the number of work hours, and safe working conditions).

explanation: