Daily revenue of a city metro system
Ridership × fare, plus the non-fare layer everyone forgets.
Estimate the daily revenue of a large city metro network (say, ~250 km, in a 15-million metro). Fare revenue is the spine; the differentiating move is remembering non-fare revenue — advertising, retail rents, and parking — which real metros lean on heavily.
Ridership
Of 15M residents, metro-accessible-and-using share ≈ 12% on a given day; each makes ~2 legs → ~3.5M rides/day.
Average fare
Slabs run ₹10–60; short trips dominate and passes discount heavily → blended ~₹32.
Fare revenue
3.5M × ₹32 ≈ ₹11.2 crore/day.
Non-fare
Advertising (train wraps, station naming rights), station retail rents, parking ≈ +20% → +₹2.2 crore.
Total
≈ ₹13–14 crore/day (~₹4,800 crore/year).
How to defend it
Volunteer the economics punchline: fare revenue rarely covers debt service for metro systems — non-fare and land monetization are strategic, not decorative. That single sentence converts a sizing answer into an infrastructure-economics conversation.