Commuter Rail

A passenger rail mode that connects a central city to its surrounding suburbs and commuter towns, typically running on shared mainline track alongside intercity and freight trains rather than on dedicated urban rapid-transit infrastructure. Service usually runs on a scheduled timetable with lower frequency than a metro system, concentrated around morning and evening peak travel, and covers longer distances than a typical subway or tram line. The mode grew gradually through the nineteenth and twentieth centuries as railways extended outward from industrial cities into their expanding suburbs, so it has no single identifiable founding system or date. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/