> Do you have any source for these numbers & the equivalent for auto travel?

There are several ways you can look at it. The easiest way is to divide the opex budget by the ridership. E.g. MTA ( https://en.wikipedia.org/wiki/Metropolitan_Transportation_Au... ) had a $19B budget in 2023 for 1.15B rides, resulting in about $16 per ride. Assuming conservatively 60 rides a month, that's $960 a month for transit in NYC. Without any capital expenses taken into account.

The average total car cost in the US in 2023 was around $1000 a month ( https://usafacts.org/articles/how-much-does-it-cost-to-own-a... ). And this includes _everything_, including the capital cost.

> Also worth noting that comparing capital costs of underground transit to above ground private travel is pretty apples and oranges. Buses would be fairer comparison IMO.

Buses don't scale for large cities.