From Wikipedia: 34th Street - Hudson Yards station
Yes the stations cost was about 2 Billion Dollars.
In October 2007, the MTA awarded a $1.145 billion contract to build the tunnels to get the trains in and out of this station. This was NYC largest contract at this time to expand the subway to this station. Put it all together with the cost of the station and construction delays it was over 2 billion dollars. Just as stated in this YT Video.
Yes: When I go to NYC we use the subways. Take the Amtrak from Toledo, Ohio to NYC.
Hope to see you out rail-fanning: Gary 🚂