Passage: A wooden platform area was built next to the entrance building and on each side of the two tracks. That was enough for the first traffic because the still short trains running to the east and the west stopped at the same platform. There were no through trains initially. The first through train ran from 1 May 1851 between Berlin and Cologne. The first railway workshop was built opposite the station building. In 1853, the opening of the first section of the Southern Railway to Alfeld, Göttingen and Kassel made the through station into a railway junction. A marshalling yard was established in Hainholz to relieve the station in 1868.

Question: When was marshalling established in Hainzholz?
1868