The railways is set to link Sikkim's capital Gangtok to capitals of all northeastern states by March 2022, a senior official said on Wednesday. With this linkage, all the seven northeastern state capitals will be connected to the national railway network, the railways official added. The capitals of Assam, Arunachal Pradesh and Tripura have been already been connected by broad gauge rail network. Work on new broad gauge lines has been taken up to connect the other state capitals -- Meghalaya (Shillong), Manipur (Imphal), Nagaland (Kohima), Mizoram (Aizawl) -- which is expected to be completed by 2020. In Sikkim, the project has been riddled with land acquisition issues. The project of laying a broad gauge line from Sivok to Rangpo of length 45 km was sanctioned in 2008-09, however, the project has been in limbo since then with just 19 per cent of work being completed so far, officials said.