This would never happen to Seattle's magical deep-bore tunnel:

Gov. Christopher J. Christie of New Jersey said on Thursday that he has decided to terminate the construction of a commuter train tunnel between northern New Jersey and Manhattan because of escalating estimates of the project’s cost.

Until last month, the project had been estimated to cost $8.7 billion. But after his staff reviewed the project, Governor Christie said they concluded it would cost more than $11 billion and possibly as much as $14 billion.

The problem there was that the state—not the feds nor the port authority that had capped their contributions—would have to pay cost overruns. And the state couldn't shoulder those cost overruns all alone. Sound familiar, Seattle?