While I've never heard that particular term used to describe it, there are lots of students yakking onboard train 872, the morning train from Hackettstown to Hoboken via the Morristown Line. This train handles students for Morris Catholic High School (bus connection at Denville) as well as numerous other private schools further east, including St. Elizabeth at Convent, several schools at Summit, and the Seton Hall prep kids who change trains at Summit. The hind end car of the train is somewhat taken over by the kids and they can be boisterous at times. When they finally all get off at Summit, the seats they were using are refilled with working commuters boarding at Summit, Short Hills and Millburn.
This train also handles a fairly large number of commuters who board out west and get off in Morris Plains, Morristown, Convent and Madison to reach nearby offices.