De que é feito metro
An urban railway separated from the streets; the first was in London.
- Turnstile — tem como parte. Turnstiles.
- Locomotiva elétrica — utiliza. The first lines were steam-operated; electric trains since 1890.
- Railway track — utiliza. It runs on rails.
- Tunnelling shield — utiliza. Metro tunnels were built with shields.
- Tunnel — utiliza. Tunnels.
- Tijolo — é feito de. The vaults of the first tunnels are brick.