Think of two types of transportation systems developed in cities during the Industrial Age: elevated trains and subways. Both are forms of railroad technology applied to city landscapes. By elevating railways above the streets or placing them in tunnels beneath the streets, city planners were able to increase commuter travel options and access.
City planners adopted railroad technology in the Industrial Age to help out commuters. Since a lot of factories were not located close to homes, people took the train to get to work as their way of transportation.
it refers to the geographical region inhabited by the ancient Tamil ... Some other Nadus are also mentioned in Tamil literature which were not part of Tamilakam,
