Siemens will supply its LZB513 automatic train control Trainguard Sicas ECC interlockings, which will replace five SpDrS-60U interlockings, two of which control the depots at Wasserleitungswiese and Hütteldorf.

The new signalling system will be commissioned in stages between 2016 and the end of 2019.

The resignalling project is part of a comprehensive upgrade of Line U4, which includes the installation of crossovers to allow single line working in the event of a failure or engineering works.