This is the entrance to a subway station located on Coruscant in 19 BBY.
The underground railway network on Coruscant was known as the Coruscant subway.
During the Battle of Coruscant, which occurred in 19 BBY, General Grievous, along with a number of IG-100 MagnaGuards, pursued Supreme Chancellor Palpatine and the Jedi Shaak Ti, Roron Corobb, and Foul Moudama through these underground tunnels in an attempt to abduct the Supreme Chancellor. This chase resulted in damage to the subway's automated turnstile, a window, and potentially even a train, due to a MagnaGuard droid being hurled in its path. After the Jedi eliminated the MagnaGuards, Shaak Ti was able to overcome Grievous by employing the Force to secure his cape to a train and activate its departure, thus carrying the general away.
Not long after this pursuit, the Jedi and Palpatine encountered Jedi Masters Mace Windu and Kit Fisto, who then boarded a train with them to reach Palpatine's secure bunker. While en route, Grievous, accompanied by several battle droids, reappeared and launched an attack on the Jedi, which led to Windu engaging the cyborg in a duel on the train's roof.
Back then, a ride on the subway required each passenger to pay two Republic credits.