Mr. Burns is forced to pay a $3 million fine for illegally dumping toxic waste under trees in the park. At a town meeting where Springfield's citizens discuss how to best use the new funds, Lyle Lanley, a charismatic traveling salesman convinces them to build a completely useless monorail. Marge is the only one in town who disapproves of the project and when the monorail is complete disaster, her reservations are proved correct.