Hellenic Railways Organisation
Proastiakos Thessaloniki, or Thessaloniki Suburban Railway (, ), is a three-line Proastiakos commuter rail service connecting Thessaloniki's New Railway Station with Edessa/Florina, Larissa and Serres. It is operated using Siemens Desiro multiple units ran by the TrainOSE, the passenger railway subsidiary of the Hellenic Railways Organisation.