Geograph - photograph every grid square

Redevelopment at Farringdon has extended the surface rail platforms south of Cowcross Street, opening up this view through a window along the Metropolitan Line tracks towards Barbican station.
On the right of the photo, the curving area of concrete marks what was previously the surface rail lines (the so-called "Widened Lines") through Barbican to Moorgate, track cut off and closed when the platforms at Farringdon were extended southwards towards City Thameslink across the eastward curve.
Visible above the tracks through a gap in the buildings, the dome of Smithfield Market, below which the tracks pass.
On the left, the brutalist concrete tower forms part of the Barbican development.