trunk line

a major long-distance transportation line.
trunk ( def 8 ).

1850–55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trunk line
1.  a direct link between two telephone exchanges or switchboards that are a considerable distance apart
2.  the main route or routes on a railway

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Crowns may be varied on each trunk line to best fit the longitudinal grades of
  each trunk line.
Demand is sufficient that public investment in trunk line fiber is likely to
  spur private investment in last-mile connections.
Each feeder line is connected to the trunk line via a bridger amplifier.
Since this is an example problem, only the sewer trunk line is designed for
  explanation purposes.
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