Trains run under the city of Athens. 

Trains run under the city of Athens. 
One line started a long time ago. It used steam to move. Later, it used power from wires. 
Newer lines go deep under the ground. One is red and one is blue. These lines help many people travel.
Many stations have art. You can also see old things found in the dirt. These are very old remains.
You can ride these trains to the airport. It is a fun way to see the city.
The Athens Metro helps people move around the city of Athens. 
One line is very old. It started in 1869 as a steam railway. Steam is a way to make power using heat. Later, in 1904, the line was electrified. This means it uses electricity to run. 
Newer lines were built to help the city. They help reduce traffic and smog. Smog is dirty air that can hurt the environment. Line 2 is the red line. Line 3 is the blue line. These lines run deep under the ground.
There are 66 stations in the whole system. Many stations show art. You can also see old items found in the dirt. These are called archaeological remains. They are very old pieces of history. 
You can even take the blue line to the airport. The system also connects to buses and trams. This makes it easy to travel everywhere. New lines are being built right now.
The Athens Metro is a fast way to travel around Athens, Greece. 

The system works using different types of electric trains. Most trains get power from a third rail. This is a metal rail that carries electricity to the train. Some trains on Line 3 use overhead lines instead. These lines hang above the tracks to provide power. This allows the trains to reach the international airport. The trains move along three main lines. Line 1 is the green line and stays mostly above ground. Lines 2 and 3 are the red and blue lines. These two lines run deep under the ground.
The history of the metro began a long time ago. Line 1 first opened on February 27, 1869. 

There are many interesting facts about the network. The system has 66 stations in total. Line 1 has 24 stations, and Line 3 also has 24. Line 2 has 20 stations. 
Traveling on the metro is easy because it connects to other transport. You can switch to buses, trolleys, or the Athens Tram. 

The Athens Metro is a rapid transit system serving the Athens urban area in Greece. 

The system operates through three distinct lines with different characteristics. Line 1, known as the Green Line, has 24 stations. It is mostly an overground, sub-surface railway. Line 2, the Red Line, consists of 20 stations and is entirely underground. Line 3, the Blue Line, also has 24 stations and is mostly underground.
Powering these trains requires specific electrical mechanisms. Most of the network uses standard gauge electric trains. These trains typically draw power from a 750 V DC third rail. This is a metal rail located alongside the tracks. However, Line 3 requires a different method for its airport section. Seven second-generation trains are equipped with pantographs to use overhead lines. These overhead lines provide 25 kV AC at 50 Hz. This specialized equipment allows the Blue Line to reach the Eleftherios Venizelos International Airport.
The history of the network began with the Piraeus–Kifissia Railway. This was originally Line 1, which opened on February 27, 1869. It started as a single-track steam railway for both cargo and passengers. The line was later electrified in 1904. Another narrow-gauge steam line opened in 1885 between Attiki Square and Kifissia. Eventually, these lines merged into the modern rapid-transit system we see today. For a long time, Line 1 was the only rapid-transit option in Athens. 
Modern expansion began in the 1990s to address urban growth. Construction of the underground Lines 2 and 3 started in November 1992. These lines were inaugurated in January 2000. Line 3 was later extended to the airport in the summer of 2004. Line 2 received extensions to Anthoupoli and Elliniko in 2013. 
The rolling stock, or the trains themselves, varies by generation. Line 1 uses a classification called "batches." The 8th batch is the oldest in service, arriving between 1983 and 1985. 

Scale and usage statistics highlight the system's importance. The entire network includes 66 stations in total. In 2010, the three lines carried approximately 1,353,000 passengers every single day. The system is highly integrated with other public transport. This includes buses, trolleys, the Athens Tram, and the Athens Suburban Railway. Passengers use the ATH.ENA Ticket or Card system for travel. This is a contactless system used to validate fares at electronic machines. While local travel is affordable, airport trips require specific tickets. A one-way ticket to the airport costs €9, while a 3-day ticket is €20. Even with these rules, the metro remains a central pillar of Greek urban life.
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