I taped the paper to the board and using a 0.5 HB propelling pencil drew the skeleton of horizontals and verticals. Then the tracks and a number of lights were then drawn in single flowing moves with masking fluid and a mapping pen. I experimented with and without masking fluid in other versions, and decided that in this situation, it's essential. Once dry, the first wash was laid, a dark, red blue mix with a few dabs of a blue/umber mix added at random.
I hope the painting's new owner likes it.