Quadruple Track Layouts
As it can be seen from the pictures below in the Gallery of diagrams, the four tracks can be paired either by direction (slow/fast in each pair) or by purpose (speed or direction in each pair).
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Famous quotes containing the word track:
“The war is dreadful. It is the business of the artist to follow it home to the heart of the individual fightersnot to talk in armies and nations and numbersbut to track it home.”
—D.H. (David Herbert)