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"underground lines" is a correct phrase and can be used in written English.
It refers to underground transportation systems, such as subways or metro lines. Example: "The city's underground lines are the most convenient way to travel to different neighborhoods."
Exact(57)
What underground lines are affected?
Underground lines are more expensive.
Underground lines can overheat.
Two Underground lines were also hit by delays.
It also connects with six London Underground lines.
And from next September five underground lines will run a 24-hour service over the weekend.
The Victoria and Central lines are the first two underground lines launching a night service.
1240 A moblogged picture from one of the underground lines today.
Five Underground lines intersect at the station, one of the biggest junctions on the system.
While the West End is served by numerous Underground lines, service to the east is spotty.
The Victoria Line, one of the younger London Underground lines, had been semi-automatic since before the DLR was born.
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