She looks down at her other stocking and starts to ungarter that.

Coordinate term: agony uncle

[…] but she was too tired for anything under heaven to disturb her, and after a moment of wakeful dreaming she was in the land of Nod!

The illuminated diagram is arranged upright, at eye level, in which position it can be seen clearly from the desks of the traffic regulator and station announcer (who also commands a good view of the station platforms).