Two teenage girls are in police custody after a stabbing rampage on Skytrain last night.

Transit police spokeswoman Anne Drennan says she's never heard anything quite like this.

She says around 11:30 p.m., a 14- and 15-year-old girl first confronted two women at the Gateway station in Surrey, one of them slashing one woman's arm.

"The two suspects (then) got on a northbound train and confronted a woman on the train, threatening her with an 8-inch, serrated steak knife, and stabbing a train seat."

Drennan says the girls exited at Columbia Station, followed this woman, and then punched her in the face.

Finally, they rode to Joyce Station and stabbed a man holding a pizza box.  They ran off from the station, but were arrested.

Drennan says they now face a litany of charges, including assault causing bodily harm and assault with a weapon, and are known to police.

It is unclear whether alcohol or drugs was a factor.

Drennan says the girls from Vancouver are part of a loosely knit  group of young people who carry out crime along the Skytrain system -- and have had 142 contacts with police going back to January 2012.

"It's extremely concerning that we're dealing with kids who are 14 and  15 and you have to ask what are they doing out that late at night.

Drennan says the girls were  involved in numerous cell phone robberies last year - also along Skytrain.