The following are events related to rail transportation in the United States that happened in 2017.

Events January January 1 – Phase I of New York City's Second Avenue Subway is opened for revenue service after almost a century of planning. January 11 - the Houston METRORail Green Line is extended from Altic/Howard Hughes station to Magnolia Park Transit Center.

February February 24 – The R Line and H Line extensions open as part of the FasTracks project in Denver, Colorado. March March 25 – The Warm Springs station opens as part of the Bay Area Rapid Transit system in the San Francisco Bay Area, California. May May 12 – Opening of Detroit's QLine. May 22 – Opening of the MBTA Commuter Rail's Boston Landing station on the Framingham/Worcester Line in Massachusetts. June June 29 – Sonoma–Marin Area Rail Transit begins preview service. August August 25 – Opening of Sonoma–Marin Area Rail Transit (SMART) commuter system in the North Bay area of San Francisco between northern Santa Rosa and downtown San Rafael, California. December December 18 - Metrolink Inland Empire–Orange County Line and San Bernardino Line are extended from the San Bernardino Santa Fe Depot to San Bernardino Transit Center to better serve the Inland Empire

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