A 33-year-old Southeast man was listed in critical condition last night after he apparently jumped in front of an outbound Red Line train at the Union Station Metro stop about noon yesterday, officials said.

Bernard Jackson of 1958 19th St. suffered head injuries and a fractured hip and underwent surgery at Washington Hospital Center's MedStar Unit yesterday afternoon, a hospital spokesman said.

The Metro stop at Union Station was closed for about 30 minutes while rescue workers removed Jackson from beneath the third car of a six-car train headed for Silver Spring, according to Metro spokeswoman Beverly Silverberg. Trains continued to run on a single track in both directions and passengers were bused between Judiciary Square and Rhode Island Avenue until full service was restored at 1 p.m.

Silverberg said Jackson apparently leaped in front of the train as it slowed to approach the station platform. She said the driver "attempted to stop the train which, of course, is virtually impossible to do. It was slowing down but you still can't stop a six-train car on a dime."

Since Metro opened in March 1976, 20 people have committed suicide by jumping onto the tracks, Silverberg said.