Line, along these lines.

Line in the sense of course of procedure, conduct, thought, is allowable, but has been so much overworked, particularly in the phrase along these lines, that a writer who aims at freshness or originality had better discard it entirely.

Poor: Mr. B. also spoke along the same lines.
Better: Mr. B. also spoke, to the same effect.

Poor: He is studying along the line of French literature.
Better: He is studying French literature.

From: William Strunk, Jr., The Elements of Style, 1918.