MUMBAI, April 14 -- This week, the local trains will slow down each time they enter the Bandra-Mahim stretch. This is owing to the 20-30 kmph speed restriction enforced by the Western Railway (WR) over the Mithi River, which be slowly eased to 45 kmph by the end of the week. During the weekend, the British-era cast iron piles of the rail bridge, over which the tracks are placed, were replaced with steel girders....