Kehdi walked through the station with purpose, her burgundy booties clicking on the tiles, to a support beam adorned with peeling blue paint, a newly-installed electronic emergency help point, and a plaque with the station’s location listed on its side. She clutched a copy of Maya Angelou’s Mom & Me & Mom in her manicured hand and lifted her smartphone in the other to capture an Instagram-worthy photo of the book with the station sign in the background…