Metro
device · 1863 · Industrial Revolution
An urban railway separated from the streets; the first was in London.
What it is made of
- Turnstile — has part. Turnstiles.
Principles and materials it uses
- Electric locomotive — uses. The first lines were steam-operated; electric trains since 1890.
- Railway track — uses. It runs on rails.
- Tunnelling shield — uses. Metro tunnels were built with shields.
- Tunnel — uses. Tunnels.
- Brick — is made of. The vaults of the first tunnels are brick.
Things built in a similar way
- Bus rapid transit — works like. A metro on the surface.