Gov. Jared Polis on Wednesday touted a new agreement between the BNSF Railway and the Front Range Passenger Rail that would deliver three daily round-trip passenger trains between Denver and Fort Collins with no new taxes and at about half the cost of earlier estimates. But a measure possibly headed for the November ballot could take away the very revenues the project is counting on. The agreement, approved Wednesday by the major transportation governing boards, would provide starter passenger rail service by January 2029. It calls for $330 million in capital improvements, funded with $156 million from the Regional Transportation District’s FasTracks savings account and $176 million from the Colorado Transportation Investment Office. Annual operating costs of roughly $30 million would be split among the partners. The agreement is non-binding and remains subject to final contracts that the parties aim to complete by June 15. Polis called the deal a major step forward.…