This article lists events related to rail transport that are currently scheduled to occur in 2027. Please be aware that the actual dates on which these events occur may differ substantially from what is shown here.

• January 1 – MRL East Coast Rail Link opening, bringing 160 km/h (99 mph) service.^[1]

• – Patna Metro Line 1 to start operations between Malahi Pakri and New ISBT.^[2]

• – Planned completion of the Penn Station Access project, designed to divert Metro-North Railroad trains to a new terminus at Penn Station in New York City.^[3]

• – Surat Metro to start operations between Sartha and Dream City.^[4]

• – Inland Rail completion.^[5]
• – Montreal REM Phase 3 to start operations.^[6]
• – SkyTrain (Vancouver) Extension of the Millennium Line to Arbutus from VCC–Clark.^[7]
• – Amtrak Wolverine is planned to expand service to Windsor, Ontario, providing a cross-border connection between Amtrak and Via Rail.^[8]
• – Ain Sokhna to Marsa Matrouh High Speed Line starts operations.^[9]
• – Opening of Paris Métro Line 18 from Massy-Palaiseau to Aéroport d'Orly.
• –Beginning of MF19 services on Paris Métro Line 13
• – DART: services from Dublin city center to extend to Maynooth and M3 Parkway.^[10]
• – Opening of the Tel Aviv Light Rail Purple Line.^[11]
• – Luxembourg tramway network extension "HOA" to 'Nei Hollerich' and Hollerich station is expected to open.^[12]
• – Planned completion of the Yangon Urban Mass Rapid Transit system.^[13]
• – quadruple-track upgrading of Gyeongbu HSR Line, claimed maximum speed increase to 400 km/h.^{[citation needed]}
• – Chuncheon–Sokcho Line 250 km/h operation starts.^[14]
• – Estimated Suseo–Gwangju high-speed branch opening.^{[citation needed]}
• – Donghae Line 250 km/h operation starts.^{[citation needed]}
• – Honam Line 250 km/h operation starts.^{[citation needed]}
• – Gyeonggang Line 250 km/h operation starts.^{[citation needed]}
• – Madrid Metro Lines 4 and 6 to be automated.^[15]
• – Stage 1 of the Jurong Region MRT line is expected to open.^[16]
• – Slussenområdet intermodal terminal upgrading completion (started in 2016).^[17]
• – Lausanne Metro Line M2 New Lausanne-Gare extension.^[18]
• – Lausanne Metro Line M3 opening.^[19]
• – Wanda–Zhonghe–Shulin line opening.^[20]
• – Estimated opening of the Chiang Mai light rail transit system.^[21]
• – Bangkok Purple Line Southern Extension opening.^[22]
• – Metra to extend to Rockford from Elgin.^[23]
• – Los Angeles Metro Rail D Line Extension Section 3 is planned to open, extending the D Line to Westwood/VA Hospital.
• – Earliest estimated opening of the New York City Subway Second Avenue Subway Phase 2.^[24]
• – Expected opening of the Southwest LRT extension of the Minneapolis Metro light rail system.^[25]
• – Planned opening of Maryland's Purple Line light rail after being delayed from 2022 and 2026.^[26][27][28] The initial prolonged delay was due to the public–private partnership's dissolution in 2020.^[29]
• – Phoenix Valley Metro Rail Capitol Extension is planned to open near the Arizona State Capitol.
• – Metra plans to begin passenger service between Chicago and Rockford, Illinois.^[30]
• – Planned completion of the Interborough Express from Bay Ridge, Brooklyn to Jackson Heights, Queens.^[31]
• – Tentative scheduling for the start of Amtrak's New Orleans–Baton Rouge passenger rail.^[32]
• – Expected completion of the New Portal North Bridge on the Northeast Corridor.^[33]