The MTA rolled out its first “open gangway” subway train on the G line Tuesday, with more expected to enter service in the coming months, according to the transit agency.

The MTA unveiled its newest train cars on the G line Tuesday, introducing a five-car fleet with an open-gangway design at Church Avenue station in Brooklyn.

Open gangway style describes the MTA’s newest set of train cars. On Tuesday, the state-run transportation agency debuted its = open gangway train on the G line at the Church Avenue station in Brooklyn — marking a significant milestone in the modernization of the subway system.