In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. The signalling appliances and tracks are sometimes collectively referred to as an interlocking plant. An interlocking is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe.
This isn't even a question, nor is it Spanish.
Sus propias características geográficas los protegieron de una invasión.
Not really sure what you have to do, but i will glady translate these for you if you wish.
2. How can Darcy communicate? She doesnt speak the language.
3. Darcy likes ancient sites. Where does she go see them in Andorra?
4. Darcy lives in Madrid. What can tourists see in Madrid?
5. IF you are in Madrid and you like art. Where can you go?
6. When you are in Barcelona, you must see the basilica "Sagrada Familia. Who made it??