Monorail train fire?
Lisa breaks it when she opens the monorail window. The dialogue goes: Homer: D'Oh! You broke the first job I liked since "Lounge in the Pool". Lisa: Don't worry, it's probably just a loose scr...
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Have you started the new questline? There is a part of the quest that stops the monorail from moving. Once you complete the task then the monorail will start moving again.
