Donald Trump’s victory Tuesday may prove a yuuge win for the New York region, at least on one vital issue: building a new train tunnel under the Hudson River.

As every commuter and his mother knows, the region is beyond desperate for new tracks between Jersey and the city. NJ Transit and Amtrak trains are now limited to single lines in and out — in a tube whose expiration date passed long ago.

Completed in 1908, the existing tunnel was in shabby shape even before Superstorm Sandy dealt it a major blow. Now officials are scrambling to replace it before it becomes unsafe and must close for repairs.

Yet building a new tube will take years — and $20 billion. If no replacement’s available during that time, commuters are out of luck.

The good news? Trump is a builder. And he has vowed to make infrastructure projects a top priority. House Democratic leader Nancy Pelosi this week talked up a deal with Trump on such projects.

The trans-Hudson tunnel needs to top the list. After all, it’s not just locals who rely on it: John Porcari, acting head of the Port Authority entity set up to oversee the project, noted this week that the train link to the city helps ensure 20 percent of the nation’s GNP.

Some good news came even before Trump’s victory in the presidential race: Efforts to lock in financing and complete environmental reviews have sped up.

If master builder and soon-to-be-President Trump gets on board, it just might be possible to head off Tunnel-maggedon.