From Halopedia, the Halo wiki
Nyali Station was a MagLev train station in operation in Nyali in the city of Mombasa, Kenya under the jurisdiction of New Mombasa Transit Authority.
In 2552 during the Battle of Earth, the station was closed for security reasons after the Covenant forces landed. The MagLev system was one of their targets in the primary assault.
The station is named after a neighborhood that exists today in the city of Mombasa. The location of the neighborhood is very near to the location of the New Mombasa Orbital Elevator.