ˌmain ˈline BrE AmE noun [countable]
an important railway that connects two cities:
the main line to Moscow
—main-line adjective [only before noun] :
a main-line station
ˌmain ˈline BrE AmE noun [countable]
an important railway that connects two cities:
the main line to Moscow
—main-line adjective [only before noun] :
a main-line station
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012