Perhaps the rail will be elevated in the middle. But it will only be a foundation, not a finished rail. When the bridge will open, I guess you won't see any rail. \
Long lasting? The Brooklyn bridge was opened in 1883
before cars were invented, not to speak of heavy trucks. It was built for horses, carriage and pedestrians. Today, it is still standing strong.
On the other hand, TZ bridge dates back only to 1955, is flimsy and falling apart for more then 20 years...
The new bridge is not very expensive. Only the lowest cost option was selected after a long process. As of today, there is still no convenient public transportation from NJ and Rockland to Westchester.