MUMBAI, Nov. 22 -- The Central Railway (CR) has scheduled six mega blocks over the weekend and the following week across the Main, Harbour and Trans-Harbour lines, causing disruptions to several suburban and long-distance services. The blocks are essential for infrastructure upgrades, including launching girders, track structure replacements and installation of electronic interlocking systems, officials said. On November 23, a mega block will be operated on the Main line between Thane and Kalyan from 10:30 am to 3:40 pm for engineering and maintenance work. During this period, suburban services will run on the slow line with halts at Kalwa, Mumbra and Diva, resulting in delays. Long-distance trains will be diverted to the fifth line. From 11:45 pm on November 22 to 11:45 am on November 23, services between Belapur and Panvel will be suspended to dismantle and insert track structures near Panvel platform 2. Harbour line trains will short-terminate or originate at Belapur, Nerul and Vashi, while Trans-Harbour services will run only between Thane and Nerul/Vashi. Several local services will be cancelled or curtailed. A block from 2:00 am to 3:30 am between Vangani and Ambarnath will be imposed from November 22-23 to December 3-4 to install 18 steel girders for a road overbridge at Badlapur. Another block between Kasara and Khardi is scheduled from 10:40 pm on November 22 to 7:40 am on November 23 for commissioning new electronic interlocking system at Umbermali as part of the Kalyan-Kasara third-line project. At Panvel-Kalamboli, expansion work for the upcoming terminus and a coaching complex will require a special block until December 3, affecting about 20 long-distance trains running via Panvel around midnight. A block on the Nilje-Dativali stretch in Thane will run from 1:10 am to 4:10 am between November 25 and December 8 to dismantle the Shilphata road overbridge. At least six long-distance trains are set to be rescheduled. CR authorities have urged the passengers to plan their travel accordingly....