The Princeton Branch is a commuter rail line and service owned and operated by New Jersey Transit (NJT) in the U.S. state of New Jersey. The line is a short branch of the Northeast Corridor Line, running from Princeton Junction northwest to Princeton with no intermediate stops. Also known as the Dinky Line, or the Princeton Junction and Back (PJ&B), the branch is served by special shuttle trains. At it is the shortest scheduled commuter rail line in the United States. The run takes 4 minutes, 47 seconds. In conjunction with Princeton University, NJT intends to shorten the line by approximately .