With the opening of Grand Central Station in Belfast, this has led to a downgrade in one section of railway, that from Belfast Central Junction to City Junction.
Prior to the closure of Great Victoria Street, trains to/from Dublin ran to Lanyon Place via the old Belfast Central Railway line, departing at Central Junction. However, all internal trains ran via Great Victoria Street, using the Blythfield Curve to do so.
With the transfer of Dublin trains to Grand Central Station, there is no scheduled service between Central Junction (A) and City Junction (B) and the double track has been reduced to single track.
