Schwartzkopffstraße is a Berlin U-Bahn station located on the U6. It was built in 1923 by Grenander/Fehse/Jennen. Due to massive financial problems, the station was built in a very simple way, without any artwork: the walls are covered only in plaster, and many columns are left as exposed, painted steel. In 1951 the station was renamed "Walter-Ulbricht-Stadion" after the stadium nearby. In 1961 the station was closed to the citizens of East Germany, rendering it a so-called "ghost station"; trains passed through the station without stopping. In 1973, despite having been closed for over 11 years, the station was renamed "Stadion der Weltjugend" to reflect the change in name of the stadium; this change was visible only to East German guards patrolling the platform, and West Berliners passing through the closed station, as ghost stations were not printed on East German city maps. In 1991 the stadium was demolished the station's name reverted to Schwartzkopffstraße. In 1995 the platform was lengthened for trains with six cars.