A depot on the
Chicago, Milwaukee, and St. Paul Railroad Evanston route was constructed at Bryn Mawr in about 1886. When the
Northwestern Elevated Railroad was extended north from Wilson in 1908, taking over from Chicago, Milwaukee & St. Paul Railroad, they opened a station at Bryn Mawr called
Edgewater Station. This station was rebuilt to a design by architect Charles P. Rawson when the tracks between
Wilson and
Howard were elevated onto an embankment in 1921 – the name was changed to
Bryn Mawr soon after. The station was extensively renovated in 1974, and an escalator was added. In 2006, the signage at Bryn Mawr was replaced, and three-sided pylons which display maps and schedules were installed in the station house and on the platform.
Red & Purple Modernization Project As part of this project, the Bryn Mawr station was rebuilt with a wider platform and new signage, lights, security cameras, and elevators. Reconstruction began in May 2021 and was completed in July 2025. During Stage A of the reconstruction, the northbound tracks were closed, with northbound trains using the southbound side of the original platform and southbound Red Line trains stopping at a temporary side platform on the original Purple line express track. Unlike a similar renovation at the same time at
Argyle, where both platforms used a common temporary entrance, northbound trains used the original entrance while southbound trains used temporary entrance half a block north, not connected to each other inside the
paid area. During Stage B (2023–25), the two western tracks were out of service, with the new eastern tracks carrying all trains, with a side platform located between each set of tracks just south of the original and permanent new platform. Only southbound trains stopped at Bryn Mawr since there is no space to build a temporary northbound platform. When Stage B finished on July 20, 2025, the station returned to its original track configuration. ==Services==