Hellenic Train has informed the public that after the opening of a single line in the Tempi Tunnel by the Infrastructure Manager OSE, train schedules IC54-IC56 from Athens to Thessaloniki and IC55-IC57 from Thessaloniki to Athens will now operate fully along this route. However, delays are expected due to the single line operations. Additionally, suburban routes between Katerini and Larissa will continue to be replaced by buses until further notice.