So the railway companies invented time zones. The telegraph made synchronization possible. In the process, solar time became obsolete. The railroad had eclipsed the sun in synchronizing human activity.
Daylight savings time is a good reminder: The railroad changed our relationship to the sun. It changed our default settings for things like time zones and work hours. It not only made travel faster, but it also changed how we relate to one another. That these norms are new is worth remembering. After all, at the end of the day, the sun still goes down like our world revolves around it.