trunk-line

trunk line

noun
1.
a major long-distance transportation line.
2.
trunk ( def 8 ).

Origin:
1850–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
trunk line
 
n
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
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