"RTD’s private-sector partner, Denver Transit Partners, has said that the problem with the crossing technology is impossible to fix."

YOU designed it.
YOU placed your bid based on it.
YOU fix it.
YOU eat the cost of the fix.
YOU stop stalling.  If it takes the finest computer experts and if they charge $500/hr, it's YOUR baby, DTP.
If it takes ripping out the whole system and working 24 hours a day at YOUR expense, well, do it RIGHT or do it OVER.