A new line was built between 1907 and 1911 on the northern edge of the Grunewald forest for suburban services to Spandau and new housing developments.

It continues to the north between the nature reserves of Tiefwerder Wiesen and Murellenberge, Murellenschlucht and Schanzenwald to reach the Hamburg and Lehrte lines, where it turns west.

For this the suburban and long-distance tracks between Heerstraße and Charlottenburg were rearranged, also making room for the new Exhibition Ground.

This new Stadtbahn-Ring interchange station was originally called Ausstellung (Exhibition), later renamed to Westkreuz (literally western cross(–ing)).

In addition, Messe Süd Station (then called Eichkamp) was built at the intersection of the Berlin-Blankenheim, the Spandau suburban and the Ring lines.

World War II had no major impact on the line and operations were quickly restored, but passengers number did not return to previous levels.