Yellow Trolley buses are inter central and their rides are much shorter since they go to the closest suburbs to the city center. Metro is the fastest means of city transit. They have to be validated at the special machine before boarding. A map with all the stops is located at each compartment. The Metro runs every 5 mins.
Tickets are the same as the blue lines.
They run 24 hours a day, every 6 mins. during daytime. The orange buses take you to the countryside of Attiki outside Athens and it's suburbs. Tickets are sold on board by an employee and they don't need to be validated. Taxis in Athens are relatively much cheaper than those in other European cities. A surcharge of 100 GRD applies for entering or leaving airport and port.