The Mumbai Skywalk Project is the erection of skywalks for
pedestrian use in the Mumbai Metropolitan Region. The skywalks connect Mumbai
Suburban Railway stations and other high-concentration commercial areas with
various heavily targeted destinations. The purpose of the skywalks is efficient
dispersal of commuters from congested areas to strategic locations, such as bus
stations, taxi stands, shopping areas, etc. Ref MMRDA website
The skywalk in the picture above is in Bandra East offering connectivity to Bandra Railway Station from various offices in Bandra East and Bandra Kurla Complex.
Duronto Express is a category of long-distance
non stop trains run by the Indian Railways. These trains do not have any
ticketing stops between the origin and the destination. "Duronto"
means "restless" in Bengali language. These trains' coaches have a
characteristic yellow-green livery. Ref Wikipedia.