Calculating Break-even-point (Bain first round interview)

I just saw this where they calculated break-even-point in a weird way and was wondering if anybody had some insight.

Essentially, there's a fixed cost of $2.5 Billion to build a new railway. There's also a variable cost of $50,000/day to operate the railway.

The daily revenue is $450,000.

The way consultingcase101.com calculated the break-even-point was doing $2.5B/50,000 per day=50,000 days. 50,000 days/365 days=140 years.

I'm a bit confused because I always thought break-even-point was when revenue=costs? There's no mention of revenue at all.

Is this method above correct? If not, how would you calculate the break-even-point?

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