A new railway station is planned for the area on Gamble street as part of the Belfast Metropolitan Transport Plan. It wont be a huge 'central station' though, you can see the location on the map below
http://www.planningni.gov.uk/index/policy/dev_plans/devplans_az/bmap_2015/bmap_district_proposals/bmap_belfast/bmap_belfast_library/bmap2015-02-001-belfast-city-centre.pdf
Stations in Belfast City Centre
5.29 The 2025 Strategy identifies two stations in Belfast city centre that should be
considered as opportunities in the longer term. These are:
♦ a new station in the Gamble Street area in the Cathedral quarter of the city
centre that should be developed as part of a larger public transport interchange;
and
♦ a new station and major public transport interchange replacing the existing Great
Victoria Street station and Europa bus station facilities as part of potential
redevelopment opportunities around Great Victoria Street and Grosvenor Road.
5.30 Both these options are contingent upon longer-term regeneration and development
proposals being brought forward and have not been included in the 2015 Plan.
Nevertheless, should circumstances arise implementation within the Plan period will
be sought.