RTD's Hail Mary Pass

I'm a little curious how an operation that's 80% funded by tax payers has "profits".

Denver Post :
"This is the largest developing market in public-private partnership infrastructure," said Crooks, who was in Denver last week at a national conference on public-private partnerships, or PPPs.

RTD expects private companies to bring at least $500 million of their own financing to the DIA train/Gold Line/maintenance center project.

In return, the private group would get a dedicated stream of payments from RTD for up to 50 years that would be structured to pay off construction debt, fund the operation
and maintenance of the trains and reward the consortium with some measure of profit.