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Partner case: should Minesaka Railway replace its branch line with buses?

The prompt

Minesaka Railway is a private railway company in Japan. Its main line is profitable, but a 40 km rural branch line loses money every year as the valley's population ages and shrinks. The CEO asks whether to close the branch line and replace it with buses. The partner says: "What would you tell the CEO, and how would you handle the prefecture?"

Your interviewer will share data as you ask for it. Ask clarifying questions, state a hypothesis, then lay out your structure out loud before you calculate.

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