Train stations turn into water world

When it rains, it pours — right into the subway.

Tuesday’s downpour turned subway stations into waterfalls and lakes, with commuters there to capture the wet and wild trips.

Inside Penn Station, water gushed across a platform, holding up subways on the Eighth Ave. line.

Southbound C trains had to run express from 59th St.-Columbus Circle to Canal St., while E trains ran express on the southbound track from 42nd St.-Port Authority Bus Terminal to Canal St.

Video posted online by a commuter showed riders trudging through a flooded station entrance at the First Ave. stop on the L line headed to Eighth Ave.

“Extremely dangerous,” one rider tweeted with his video of the L train station.

The MTA dispatched workers to sweep out the water and unclog a drain with a snake. A discarded MetroCard was the culprit, according to a worker on scene.

“One MetroCard can wreak havoc on the whole station,” the transit worker said.

The 42nd St.-Bryant Park station also got pounded in the downpour, sending buckets of water crashing to the platform.

Across the city, and especially in Queens, the rain turned streets into lakes — in some cases submerging vehicles.

The wacky weather is a holdover from deadly Tropical Storm Florence, which hit the South hard.