This proved itself in June of the same year, when East Berlin workers responded with protests to an increase in the "Arbeitsnorm" ("work norm": the quantity of work required to be performed in a shift). News of the 17 June 1953 uprising spread like wildfire across the GDR. About 20,000 strikers demonstrated not only against the norm increases, but also against the general conditions in the country. The BVG East stopped U-Bahn operations and Deutsche Reichsbahn stopped S-Bahn operations at the border at 11 am. The western trains now ended in the new turnback facilities. In total, the West Berlin BVG lost only 18 trains due to the well thought-out timetable. The northern section of line D, including the stations of Voltastraße and Gesundbrunnen, which had no connection to the rest of the West network, was closed.