1. Verbal or recorded messages provided to passengers regarding metro services and station updates.

2. A reusable plastic or electronic card used to pay for metro rides.

3. When there are too many passengers on board a train or within a station.

4. A moving stairway used for passengers to easily move between different levels of a station.

5. A spacious area within a metro station where passengers can gather or wait.

6. A gate or barrier that allows only one person at a time to enter the metro station.

7. A schedule of the departure and arrival times of trains at different stations.

8. A plan of departure and arrival times for metro trains.

9. The operator or driver of a metro train.

10. Measures and protocols in place to ensure passenger well-being and prevent accidents.

11. An underground railway system, typically found in urban areas.