Wikipedia:Articles for deletion/Line 6 (Montreal Metro)
I'd say... a https://www.google.ca/search?q=Line+6+(Montreal+Metro&rlz=1C5CHFA_enCA548CA548&oq=Line+6+(Montreal+Metro&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8#q=Line+6+(Montreal+Metro&tbm=nws&tbs=ar:1 Google News Archive search reveals multiple news refs from the ''Montreal Gazette'' in 1982-4, satisfying  for this unbuilt line. The defunct (but not online ''Montreal Star'' would have more, I'm sure
— User:Shawn, 01:07, 6 September 2013 (UTC)
Stance: keep
Cited policy: WP:GNG (Wikipedia:Notability)