Mumbai: Western Railway will execute a four-hour jumbo block on the suburban section between Mahim and Mumbai Central stations during the intervening night of Saturday and Sunday. An official said the maintenance block will run from 12.25 am to 4.25 am to carry out essential work on track, signalling and overhead equipment. During this period, all fast-line suburban trains will be diverted and operated on the slow line between Andheri/Santacruz and Churchgate. Commuters are advised to plan their journeys accordingly.