(Disneyland, 1978-79) A set of (18) Imagineering blueline prints used in the creation of the Big Thunder Mountain Railroad attraction at Disneyland. The material provides a rare look at the complex inner workings of the attraction, consisting of diagrams for the electrical wiring of the ride and schematics of control consoles and various electronic systems with (3) revisions of the same diagram, (2) copies of the same plan, (2) unique prints, and (11) from the same numbered series. Ranging in size from 22"x17" to 36"x50", the bluelines are in generally good to very good condition with some hand annotation, yellowing, cross fold separation, water damage, paper clip stains, and handling wear.