Walt Disney's Comics and Stories #512
In "The Success Test," Mickey and Goofy face a tough assignment when mysterious railroad car disappearances land them in hot water with Mr. Boomer, who forces them to search the tracks on foot. While they're busy investigating, the Clinker Brothers take over the engine—unaware they're being used by the cunning Gruggers, who's behind the thefts all along. Written by Carl Fallberg and brought to life with energetic art by Paul Murry, this 1986 adventure blends classic Disney charm with a clever twist. The cover, by Daan Jippes, captures the moment with playful precision.
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Railroad cars continue to "vanish" on Mickey and Goofy's watch. An angry Mr. Boomer blames the pair for the disappearances and orders them to go over every inch of track on foot in order to locate the missing cars. Meanwhile, during Mickey and Goofy's demotion, the Clinker Brothers are hired by Mr. Boomer to run the engine, playing right into the hands of Gruggers who is behind the thefts.
Plot details indexed by the Grand Comics Database (CC BY-SA).