Woraus metro besteht
An urban railway separated from the streets; the first was in London.
- Turnstile — hat als Teil. Turnstiles.
- Elektrolokomotive — nutzt. The first lines were steam-operated; electric trains since 1890.
- Railway track — nutzt. It runs on rails.
- Tunnelling shield — nutzt. Metro tunnels were built with shields.
- Tunnel — nutzt. Tunnels.
- Backstein — ist hergestellt aus. The vaults of the first tunnels are brick.