I don't know what the split is elsewhere, but it's worth noting that for BART in the Bay Area, at least, makes something like $10m/yr, compared to nearly $500m/

I don't know what the split is elsewhere, but it's worth noting that for BART in the Bay Area, at least, makes something like $10m/yr, compared to nearly $500m/yr in actual fares - so, in exchange for approximately 2% of annual revenues, we get BART trains and stations covered in ads. Edit: Thought to look this up for SFMTA - 2020 proposed budget (projections as of 2019, chosen because it's the last "normal" year) - total revenue $1.2Bn, "Advertising, interest, and service fees" $54m.