The signalling control system was modernised to coincide with the commissioning of the Zürich S-Bahn. It is equipped with a computerised controller that performs the standard operations. Apart from the tracks and points (switches) of the "Sihlpost station" (which are controlled by an electronic control system), the entire control of the points and signals in the Langstrasse–Concourse section is still largely under relay control, in some cases with the original relay sets installed in 1966.