Euskotren operates frequent commuter rail services in the city of San Sebastián and the surrounding Donostialdea area, in the Basque Country, Spain.

[2] As of 2021, the San Sebastián suburban rail services are branded as part of the Euskotren Trena network, with no separate identity.

[5] The network was subsequently owned by FEVE, the Spanish narrow-gauge railway company, until it was transferred to the Basque Government in the 1970s.

[6][7] A 4.2 km (2.6 mi) underground loop through the city centre was originally planned to open in 2022,[8][9] but is now (as of 2023[update]) scheduled for 2025 or early 2026.

[10] This new tunnel will have three stations: Benta Berri, Centro-La Concha and Easo;[11] the last one of which will substitute the current Amara terminus.

[15] Due to the existence of various overlapping services, headways vary depending on the time of the day and location.