North of the station, the line swings to the east, to run directly under Yonge Street in a bored tunnel.

There is a station entrance and waiting room at the northeast corner of the bus terminal.

The 13-ton panel will be made of mirrored glass tiles and is inspired by minerals, crystals and gemstones evoking the "subterranean nature of rapid transit", according to the artists.

[4] Structures to be constructed at Eglinton station as part of the Line 5 project are: In November 2013, the TTC originally proposed to shift the current Line 1 platform approximately 70 metres (230 ft) northward of its current location.

[17] However, this proposal was modified by March 2018 to shift the Line 1 platform north by only 24 metres (79 ft), allowing the pocket track to be retained.

It initially had nine parallel bays within the fare-paid zone, each with a covered platform and staircases leading down to an east–west, underground concourse.

Along with the extension, a pocket track was installed on the north side of the station to reverse some Line 1 trains.

[10] Also with the extension, Glen Echo Loop was closed and the Yonge trolley bus route was converted to diesel.

This left Nortown as the only trolley bus route serving Eglinton station.

[10] In 2004, this station became accessible with the addition of elevators, and also with the closure of the old bus terminal which had required passengers to use stairs to reach the buses.

[23] In October 2021, automatic train control (ATC) was extended to Eglinton station.

ATC had been adjusted the previous day so that trains stopped 24 metres (79 ft) further north.

Built directly over the station is the Canada Square Complex, which is home to TVOntario studios and the head offices of Canadian Tire.