Blaine the Mono is a fictional character in author Stephen King's
The Dark Tower series. Blaine is immortalized as one of the subjects of Jake Chambers' English essay entitled "My Understanding of Truth".
Blaine is a creation of North Central Positronics. Much more than a mere train, Blaine is also a part of the computer intelligence running the city of Lud and influencing the Pubes and Grays that dwell there.
Blaine has gone mad and has split into two personalities: Big Blaine, who runs the show, and Little Blaine, the representative of the remainder of Blaine's sanity.
Blaine is obsessed with riddles, to the point where he makes a deal with Roland and his ka-tet: if they can stump him with a riddle, Blaine will deliver them safely to their destination. If they have failed to stump the Mono by the time they reach Topeka, they will be unwilling participants in Blaine's suicide.
Original artwork by Steve Stone
----------
References
Furth, Robin. Stephen King’s The Dark Tower: The Complete Concordance. Scribner, 2006. ISBN 0743297342
King, Stephen. The Gunslinger (The Dark Tower, Book I, Revised). Viking Adult, 2003. ISBN 0670032549
King, Stephen. The Drawing of the Three (The Dark Tower, Book II). Viking Adult, 2003. ISBN 0670032557
King, Stephen. The Waste Lands (The Dark Tower, Book III). Viking Adult, 2003. ISBN 0670032565
King, Stephen. Wizard and Glass (The Dark Tower, Book IV). Viking Adult, 2003. ISBN 0670032573
King, Stephen. Wolves of the Calla (The Dark Tower, Book V). Donald M. Grant/Scribner, 2003. ISBN 1880418568
King, Stephen. Song of Susannah (The Dark Tower, Book VI). Donald M. Grant/Scribner, 2004. ISBN 1880418592
King, Stephen. The Dark Tower (The Dark Tower, Book VII). Donald M. Grant/Scribner, 2004. ISBN 1880418622
Vincent, Bev. The Road to The Dark Tower: Exploring Stephen King’s Magnum Opus. New American Library, 2004. ISBN 0451213041