[3][4][5] The Fulton Street subway was the city-owned Independent System (IND)'s main line from Downtown Brooklyn to southern Queens.

[6] Further construction past the line's initial terminal at Rockaway Avenue was delayed by funding problems due to the Great Depression in the 1930s.

On July 15, 1937, the BOT submitted a modified plan for the extension of the Fulton Street Line, Route 110-B, to the New York City Board of Estimate.

At the time of the announcement, work was being done to shore up the tunnel walls, to replace the wooden decking covering the open cut with pavement, and finishing the stations.

[6][14][15] At the time, work on the section that included the Liberty Avenue station was more than 99% complete, but vital equipment had yet to be installed, precluding its opening.

[16] Construction resumed on the extension of the Fulton Street Line in November 1946,[17][18] following the conclusion of the war and the allocation of funds obtained by Mayor William O'Dwyer.

[19][6] After several test runs, the station opened to the public in the early morning of November 28, 1948, along with the rest of the line to Euclid Avenue.

[27] On alternating columns separating the local and express tracks there are signs that read "LIBERTY AVE" in black on white.

[29][30] Small tile captions reading "LIBERTY" in white lettering on dark periwinkle run under the trim line, and directional signs in the same style point towards the exit and are present under some of the name tablets.

At the southern end of the mezzanine, a fence separates the paid and free areas of the station, with a bank of three turnstiles.