In 1915, the BMT, under their portion of the Dual Contracts, added the current three-track elevated structure along the Queens section of Liberty Avenue,[2][4] which is now the only remnant of the line.

To replace that service, the underground IND line was extended east (railroad south) from its previous terminus at Euclid Avenue via a new connecting tunnel and ramp.

An intermediate station, also called Grant Avenue, was built along this tunnel, right before the point where the track was then elevated to connect to the remaining sections of the BMT el.

[9] Both platforms have beige windscreens along their entire lengths and brown canopies with green frames and support columns except for a small section at either ends.

Inside fare control, there is one staircase to each platform, a waiting area that allows a free transfer between directions, and a turnstile bank.

Part of the trackways to the BMT el still remain as this line curves south into the tunnel to Grant Avenue west of 80th Street.