When travelling on such short distances, you can take into account also busses and carpooling options: with some luck you will find very cheap options, even if you book on short notice.
What are the departure and arrival stations in Katerini and Athens?
The trains to Athens leave Katerini from Katerini and arrive in Athens or Rouf.
How many daily connections exist to travel to Athens from Katerini by train?
How long do you need to get to Athens by train?
The first train to Athens leaves at 00:11, whereas the last one at 19:09. On average, the journey lasts 3 hours and 47 minutes, but with the fastest connections you will be in Athens in 3 hours and 24 minutes.