There are some wonderful railway arches near Waterloo. They are architectural marvels, with striking mathematical curves and uncountable numbers of bricks. Here is a view from underneath one such arch, on Carlisle Lane, looking North towards Waterloo.

The building on the left of the picture is “Canterbury House” on Royal Street, built 1959-1960. The greenery at the front is part of gardens and allotments, adjacent to Archbishop’s Park.
The white notice below the “No Entry” sign says “Except cycles”.
Here is a close up of the picture. The parts marked with arrows show where I lifted the wet paint off the paper to make a white mark.
The main colours are Phthalo Turquoise, Fired Red Ochre and Mars Yellow, with a bit of Transparent Pyrrol Orange for the traffic sign. This is on a sheet of Jackson’s watercolour paper, 12″ x 10″.