The assembly of the steel bridge for the south curve to the Ringbahn, which consists of 22 individual parts, using the incremental launch method began in early 2015, with a total of €21.4 million invested in the construction of the new south curve. Since 10 December 2017 the line S9 has run again on the newly built curve, but without stopping at Ostkreuz station. At the same time platform Ru became operational for regional services on lines RE1, RE2, RE7 and RB14. Regional services also stopped serving Berlin-Karlshorst station.