TCDD District 1 is one of the 7 districts of the Turkish State Railways

Turkish State Railways

The State Railways of the Turkish Republic or TCDD is the government owned, national railway carrier in the Republic of Turkey, headquartered in Ankara...

. The headquarters are in Haydarpaşa Terminal

Haydarpasa Terminal

The Haydarpaşa Terminal or Haydarpaşa Station is a major intercity rail station and transportation hub in Kadıköy, İstanbul. It is the busiest rail terminal in Turkey and the Middle East and one of the busiest in Eastern Europe. The terminal also has connections to İETT bus and ferry service. The...

 in İstanbul

Istanbul

Istanbul , historically known as Byzantium and Constantinople , is the largest city of Turkey. Istanbul metropolitan province had 13.26 million people living in it as of December, 2010, which is 18% of Turkey's population and the 3rd largest metropolitan area in Europe after London and...

. Except for the Kırklareli Branch and the Pehlivanköy-Uzunköprü line, the entire district is electrified with over head catenary

Overhead lines

Overhead lines or overhead wires are used to transmit electrical energy to trams, trolleybuses or trains at a distance from the energy supply point...

. The district operates 876 kilometers of track. It operates part of the Istanbul-Ankara Main Line

Istanbul-Ankara Main Line

The İstanbul-Ankara Main Line is the busiest rail line in Turkey, in terms of railway and passenger traffic and is the primary route of the State Railways as it serves a large population between Turkey's two largest cities. The line is long and runs between Turkey's largest city İstanbul to...

 from Haydapaşa to Polatlı

Polatli

Polatlı is a city and a district in Ankara Province in the Central Anatolia region of Turkey, 80 km west of the Turkish capital Ankara, on the road to Eskişehir. According to 2010 census, population of the district is 117,473 of which 98,605 live in the city of Polatlı...

, the old CO main line (İstanbul-Uzunköprü), the Edirne Cut-off

Edirne Cut-off

The Edirne Cut-off is a long rail line from Pehlivanköy, Turkey to Svilengrad, Bulgaria. The line was built in 1971 by the Turkish State Railways in order to avoid crossing the border with Greece, on the former Oriental Railway's main line, in order to get to Edirne. The Hellenic Railways...

, the Adapazarı Branch and the abandoned Kırklareli Branch. The district also operates rail service to the ports of Haydarpaşa

Port of Haydarpasa

The Port of Haydarpaşa, also known as the Port of Haidar Pasha is a general cargo seaport, ro-ro and container terminal, situated in Haydarpaşa, Istanbul at the southern entrance to the Bosphorus...

 and Derince. The district operates lines from İstanbul

Istanbul

Istanbul , historically known as Byzantium and Constantinople , is the largest city of Turkey. Istanbul metropolitan province had 13.26 million people living in it as of December, 2010, which is 18% of Turkey's population and the 3rd largest metropolitan area in Europe after London and...

 to other towns and cities such as: Çerkezköy

Çerkezköy

Çerkezköy is a town and district of Tekirdağ Province in the Marmara Region of Turkey.-Facts:The district is located in inland Thrace just to the west of the outlying Istanbul districts of Çatalca and Silivri. Çerkezköy is an industrial area. It is from Tekirdağ and from Istanbul but in many ways...

, Uzunköprü

Uzunköprü

Uzunköprü is a small town and a district of Edirne Province in northwestern Turkey.It is on the railway line from Istanbul towards Sofia, Belgrade and western Europe, and a frontier post on the Greek border.- Long Bridge :...

, Edirne

Edirne

Edirne is a city in Eastern Thrace, the northwestern part of Turkey, close to the borders with Greece and Bulgaria. Edirne served as the capital city of the Ottoman Empire from 1365 to 1453, before Constantinople became the empire's new capital. At present, Edirne is the capital of the Edirne...

, Kapıkule

Kapikule

Kapıkule is the Turkish frontier town in Edirne Province on the border of Turkey and Bulgaria. Its counterpart on the Bulgarian side is Kapitan Andreevo. Together, they are the busiest land border crossing point in the world and the busiest in Europe....

, Gebze

Gebze

Gebze is an industrial city in Kocaeli Province, Turkey. Situated 30 miles east of Istanbul on the northern shore of the Sea of Marmara, it is the largest district of Kocaeli; Gebze has experienced rapid growth in recent years- from 159,116 in 1990, to 282,444 in 2009. Gebze accounts for 15% of...

, İzmit

Izmit

İzmit is a city in Turkey, administrative center of Kocaeli Province as well as the Kocaeli Metropolitan Municipality. It is located at the Gulf of İzmit in the Sea of Marmara, about east of Istanbul, on the northwestern part of Anatolia. The city center has a population of 294.875...

, Adapazarı

Adapazari

Adapazarı is a city in northwestern Turkey and the capital of Sakarya Province. The province itself was originally named Adapazarı as well. Adapazarı is a part of the densely populated region of the country, known as the Marmara Region. As of 2010, the city has a population of 560,876 ...

, Bilecik

Bilecik

-External links:* http://www.eksisozluk.com/show.asp?t=bilecik%20diye%20bir%20yerin%20asl%C4%B1nda%20olmamas%C4%B1%20 Bilecik Conspiracy* http://www.bilecikaktuel.com* * http://www.voyagerbook.com/eng/iller/11/11.asp*...

, Eskişehir

Eskisehir

Eskişehir is a city in northwestern Turkey and the capital of the Eskişehir Province. According to the 2009 census, the population of the city is 631,905. The city is located on the banks of the Porsuk River, 792 m above sea level, where it overlooks the fertile Phrygian Valley. In the nearby...

 and Polatlı

Polatli

Polatlı is a city and a district in Ankara Province in the Central Anatolia region of Turkey, 80 km west of the Turkish capital Ankara, on the road to Eskişehir. According to 2010 census, population of the district is 117,473 of which 98,605 live in the city of Polatlı...

.