- Bobadilla - Algeciras line
- Canfranc
- Canfranc
- Canfranc
- Canfranc
- Chanza Canal
- Elbtunnel
- Elbtunnel
- Elbtunnel
- Elbtunnel
- Elbtunnel
- Elbtunnel, northern building
- Elbtunnel, southern building
- Guadiana Railway
- Guadiana Railway
- Levkovtsi
- Levkovtsi
- Levkovtsi
- Levkovtsi
- Pomarão
- Pomarão
- Tiouli tunnel
- Tiouli tunnel
- Torralba