Don't forget to buy food and drinks in advance if you need them: train stations do not always have shops, while onboard cafés are not always available and often very expensive.
For short distances like between Chalcis and Athens, busses and carpooling are good alternatives to the train, thanks to their low costs. Also, busses have the advantage of getting to the smallest towns where the is no train station.
Which stations do the trains to Athens leave from?
You can take the train to Athens at Chalkida, which arrives at Rouf or Athens.
How long will it take you from Chalcis to Athens by train and when do the trains leave?
The first train to Athens leaves at 10:08, whereas the last one at 20:08. On average, the journey lasts 1 hour and 29 minutes, but with the fastest connections you will be in Athens in 1 hour and 17 minutes.