Volume 6 of the Maine Line contains five issues - 1-5 - not the six one would expect in a publication "Published bimonthly by the Public Relations Department of the Bangor and Aroostook Railroad Company, Bangor, Maine" a notation that appears in both of the two issues surrounding the non-existent Issue 6. Neither of said issues contains a note about Issue 6 not being published. We are left then with a mystery as no explanation was given for only five issues.
|November - December 1957|
|January - February 1958|
|March - April 1958|
|May - June 1958||First cover of a Maine Line to feature a Bangor and Aroostook bus|
|July - August 1958|