That's not quite the same thing. What you quoted is referring to the IRS tax exemption for the first $255 per month spent on approved commuting costs (parking

That's not quite the same thing. What you quoted is referring to the IRS tax exemption for the first $255 per month spent on approved commuting costs (parking and mass transit). What mgreg refers to is the direct money that is used to fund/subsidize the cost of operating bus/train networks in urban areas. The cost of those tickets are less than they would be without the subsidies. These are two totally separate things.