Extending the platforms towards the north could not be done due mainly due to the steep gradient (1 in 27) of the Thameslink line immediately north of Farringdon. The platforms therefore had to be extended to the south, cutting off the two-station branch to Moorgate. As a result, since Christmas 2009 Thameslink trains no longer call at Barbican and Moorgate stations, but London Underground still serve those stations.