These icons were extracted from images on Carsten S. Lundsten's web site.
Please see http://www.lundsten.dk/us_signaling/abs_st_sp/index.html#example
Images with names like "os-upper-right-closed.gif" represent:
"os" - turnout with end-of-track-circuit markers in this icon.
"turnout" - there are no end-of-track-circuit markers.
"segment" - straight track segment
"block", "block-end" - icons for drawing a straight block
"upper" - the diverging route is above the horizontal mainline
"right" - the diverging route goes to the right
"closed" - the mainline is selected (c.f. "thrown" for diverging route selected)
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