Mumbai, Feb. 4 -- Union railway minister Ashwini Vaishnaw on Monday said the headway or interval between suburban locals in Mumbai will be brought down from the current 180 seconds (3 minutes) to 120 seconds (2 minutes). Efforts are also underway to improve ventilation and air conditioning in local trains using technology similar to that used in Vande Bharat rakes, Vaishnaw told reporters during his visit to the city....