1
general::
Phrase(s): the end of the line
Go to the end of the road and the end of the line
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, end of the road. The conclusion or final outcome. For example, The editorial pointed out that it was the end of the line for the President; he'd never be reelected, or It was obviously the end of the road for this television series. This idiom alludes to the point where a road or line stops. [c. 1900]
American Heritage Idioms