Why was standardization of tracks and time zones important for railroads? (p. 489- 490)
They made it possible for towns to lay their own tracks.
They forced Pullman and others to build cars according to certain standards.
They reduced competition in the western part of the country.
They offered greater efficiency in production, safety, and scheduling.

They offered greater efficiency in production, safety, and scheduling.

Explanation:

The establishment of time zones and the standardization of tracks were two important developments for railroads. Before the standardization took place, each town had its own time zone, which made it very difficult for the railroad to establish its departure and arrival times. It also made it difficult for people to make their plans. With standardization, railroads became more efficient.