Shore Line East (SLE) is a commuter rail service which operates along the Northeast Corridor through southern Connecticut, United States. The rail service is a fully owned subsidiary of the Connecticut Department of Transportation (CTDOT) and is operated under the CT Rail brand. SLE provides service seven days a week along the Northeast Corridor between New London and New Haven; limited through service west of New Haven to Bridgeport and Stamford has been suspended since 2020. Cross-platform transfers to Metro-North Railroad New Haven Line trains are available at New Haven for service to southwestern Connecticut and New York City. Pre-COVID, around 2,200 riders used the service on weekdays.

CT Rail, stylized as CTrail, is the brand for commuter rail services overseen by the Connecticut Department of Transportation (CTDOT), in the U.S. state of Connecticut, with some service extending into Massachusetts. CTDOT oversees two lines: Shore Line East, between New Haven and New London, Connecticut, and the Hartford Line, from New Haven, through Hartford, to Springfield, Massachusetts.