The next-level upgrade of Mumbai railway has started on the ground. Eight companies, many of them prominent international names, have bid for the railway upgrade initiated by the Mumbai Railway Vikas Corporation (MRVC).

The MRVC has launched technical studies to assess the feasibility and requirements of various aspects of phase four of the Mumbai Urban Transport Project (MUTP), including the integration of Communications-Based Train Control (CBTC), also known as cab signalling, and Kavach systems.

Initiated in 2002, the Mumbai Urban Transport Project (MUTP) has changed the design of Mumbai locals, inducted new trains and built additional corridors. The fourth phase will now take local trains deeper into the Mumbai Metropolitan Region (MMR).