Diagram
In the UK, the interrupter is shown on signal box diagrams as two closed triangles inside the points.
Read more about this topic: Track Circuit Interrupter
Famous quotes containing the word diagram:
“If a fish is the movement of water embodied, given shape, then cat is a diagram and pattern of subtle air.”
—Doris Lessing (b. 1919)
““God’s fire upon the wane,
A diagram hung there instead,
More women born than men.””
—William Butler Yeats (1865–1939)