Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The station opened on October 17, 1943, as part of the State Street subway. The layout is typical of most stations from this section, with fare control on a mezzanine level between the street and platform. In 2006, the KDR standard signage at Harrison was replaced by the newer Current Graphic Standard signage. On February 9, 2009, an auxiliary entrance at Polk Street that was closed in 1968 was reopened due to an increase of both business and residents living in the South Loop neighborhood. On April 14, 2014, the Polk Street auxiliary entrance was temporarily closed, reopening on May 25, 2014. Later the same year, the main entrance closed on June 16 and reopened on July 28. The station entrance at Harrison is located directly in front of Jones College Prep High School.