There will be no services on the Athens-Piraeus urban electric railway (ISAP) or Proastiakos suburban railway on Thursday due to a 24-hour strike by Hellenic Railway Organization (OSE) engineers.
Work stoppages will also affect ISAP and Proastiakos services next week.
The interruption of service at the Proastiakos also means there will be no trains to Athens aiport for the duration of the walkouts.
According to a statement issued by the Panhellenic Federation of Railway Workers (POS), there will be stoppages on June 14, 15, 16 and 21 from 5 a.m. to 8 a.m., 1 to 4 p.m. and 9 p.m. until midnight.
There will also be a 24-hour strike on June 22.