SNS 38, Streatham

sixthland posted a photo:

A pedestrian underpass beneath one of the Victorian railway lines threading through south London. The oval plate identifies it precisely: SNS 38, 6 miles and 29 chains from its datum point, a British Railways engineering reference that's probably older than anyone who uses this passage.

The double arch and corbelled brickwork are London, Brighton and South Coast Railway, likely 1860s or 70s. The bollards and strip lights came much later. Vegetation is winning.