A train engineer is hospitalized after officials say he was attacked by a mob that dragged him from an Amtrak train it had forced to stop by standing on the tracks.

An Amtrak official says the engineer on the Capitol Corridor train was en route from the San Francisco Bay area and approaching Sacramento when he encountered the group of people blocking the tracks near a signal.

Officials say after the stopping the train, the engineer opened the door, was pulled off and then assaulted with rocks and bottles.

The engineer was taken to the UC Davis Medical Center with head injuries and possible internal injuries.

The Capitol Corridor operates a route that runs from Auburn to San Jose.

Union Pacific police arrested one person who is a minor. They are still looking for several other suspects.

The city of West Sacramento is now working with Union Pacific to try and prevent more incidents like this.

"Between Union Pacific police, Sacramento police and our local police department to deal with not only enforcement issues but clearing some of the brush along the rail tracks to try to make it easier to get eyes on the tracks not only by law enforcement and community members." West Sacramento Mayor Christopher Cabaldon told CBS13 News.

Two teenagers with alleged gang ties are the latest to face charges in a recent attack that injured an Amtrak engineer.

Four suspects are now in custody and police said all are believed to have links to a local gang.

Police said the group blocked at Capitol Corridor train on April 16 west of the I Street bridge.

The group is accused of beating the engineer as he tried to get them to move.

Investigators are still searching for 19-year-old Pauliton Nunes, who is believed to have played a role in the attack.

Nunes is 5 feet 9 inches tall and 155 pounds.

A warrant has been issued for the arrest of Nunes. He could face charges of attempted murder and street gang terrorism.