Navi Mumbai has scaled down its Metro project into an electric trolley-bus system, known as Metro Neo. This, in one stroke, isolates the satellite city of Navi Mumbai from any future Metro rail connections with the upcoming Maha Mumbai Metro network being developed in the Mumbai Metropolitan Region and has broken the link for any future expansion. 

Seamless Metro rail connectivity with Navi Mumbai will be a crucial link once the new airport comes up. The decision has received widespread criticism, but CIDCO officials said it has been done with the cost factor in mind as Metro Neo is economical.