Initially, the trials will take place at night to avoid disrupting service on the existing metro line. The government is also moving ahead with an integrated ticketing system that will allow passengers to use a single fare across the Thessaloniki Metro and the city’s bus network. Looking beyond the Kalamaria extension, Tachiaos said preparations are underway for the metro’s planned expansion toward northwest Thessaloniki, with a cost-benefit study being commissioned to support future financing applications. Athens Metro Line 4He also addressed work on Athens Metro Line 4, confirming that construction in the congested central Kypseli district remains temporarily suspended while additional technical and geological studies are completed following concerns about cracks in nearby buildings. The latest milestone follows the successful launch of Thessaloniki’s fully automated metro network late last year.