
Rapid transit
        A rapid transit, underground, subway, elevated railway, metro or metropolitan railway system is an electric passenger railway in an urban area with a high capacity and frequency, and grade separation from other traffic. Rapid transit systems are typically located either in underground tunnels or on elevated rails above street level...
    Timeline of Events
    | 1870 | 
 | |
| 1897 | 
 | |
| 1918 | 
 | |
| 1927 | 
 | |
| 1954 | 
 | |
| 1995 | 
 | |
| 1998 | 
 | 

