branch line

noun
a rail line, directly or indirectly connected with a main line, having its own stations and service.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
branch line
 
n
railways a secondary route to a place or places not served by a main line

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Suppose there is a runaway trolley car on a line that cannot be stopped, but it can be switched onto a branch line.
Lower laterals are the remaining section of the branch line, which runs from the property line to the sewer main.
In some cases, a single branch line at the peak of the attic can provide complete protection.
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