loop-line

from WordNet (r) 3.0 (2006)
loop-line
    n 1: a railway branch line that branches from the trunk line and
         then rejoins it later on
from The Collaborative International Dictionary of English v.0.48
loop-line \loop-line\ n.
   a railway line that branches from the trunk line and then
   rejoins it at another point.
   [WordNet 1.5]
antiflux / dictionary / loop-line
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