Loksatta. The first phase of Metro Line 4 and 4A from Cadbury Junction to Gayamukh in Thane will start by December end, aiming to reduce traffic congestion and improve daily commute efficiency. Mumbai Metro 4 Gaikmukh to Cadbury Junction route: ठाणेकरांसाठी एक अत्यंत आनंदाची बातमी.