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, or the Princeton Junction and Back (PJ&B), the branch is served by special shuttle trains. Now running 2.7 mi (4.3 km) along a single track, it is the shortest scheduled commuter rail line in the United States. The run takes approximately 5 minutes in each direction.