Happy anniversary, New York City subway!

The Metropolitan Transportation Authority is marking the 115th anniversary of the opening of the first rapid transit subway.

The subway line running along Manhattan�s east side connecting City Hall with Harlem opened on Oct. 27, 1904.

That line was owned by a private company. In following years, another private company and a city-owned company also opened subway lines.

The lines came together in what�s now the city subway system in 1940.

The MTA is marking the anniversary in a number of ways, including a digital exhibition of photos from the construction of the original subway line.

The photos are being displayed at the subway stations on that line.

(AP)