These trains connect major Turkish cities throughout the country but they are progressively stopped as the YHT network expands.

[3] High-speed trains are branded as Yüksek Hızlı Tren or YHT and operates at speeds of up to 250 km/h (160 mph).

During the final year before TCDD Taşımacılık took over operations, mainline trains carried over 1.3 million passengers.

The most frequent regional rail service in Turkey is between Adana and Mersin with 27 daily trains in each direction.

During the final year before TCDD Taşımacılık took over operations, regional trains carried over 13.5 million passengers.

[4] Commuter rail service is currently provided in Istanbul, Ankara and Gaziantep; with new networks under planning stage in Konya and Afyonkarahisar.

There is another commuter rail service between Halkalı and Bahçeşehir (both in Istanbul province), but due to the lack of a signalling system and double tracks, trains only operate once in the morning and once in the evening in each direction.

All commuter rail service operates on its own right-of-way, similar to some S-Bahn systems in Germany, and are fully integrated with their respective cities' transportation network.

Currently, TCDD Taşımacılık operates two international trains from Istanbul to Sofia and Bucharest in Bulgaria and Romania respectively.

Once the rehabilitation of the railway east of Halkalı is completed in late 2018, international train service will resume from their former terminus, Sirkeci station.

A new international passenger service from Kars to Baku, Azerbaijan, was expected to start June 2018 via the recently completed Baku–Tbilisi–Kars railway.

[5] Due to the volatile situation in Syria and Iraq, all international train service to the middle-east is suspended indefinitely.

[6] Approximately 50% of freight moved is minerals or ores, with construction materials increasing to ~10% in 2000 from less than 5% in 1980, food/agricultural products, chemicals/petroleum, and metal sectors each account for between 5 and 10%.

Two steel companies, Erdemir and Kardemir, top 2 customers of TCDD, had transported 4.5 million ton in 2012, mainly iron ore and coal.

[11] This will be complemented with the construction of 18 logistic centers in order to increase the ratio of domestic freight transported by rail.

Two steel companies, Erdemir and Kardemir, top 2 customers of TCDD, had transported 4.5 million ton in 2012, mainly iron ore and coal.

[21] TCDD is planning to increase its transit traffic (11000 to in 2011) by constructing "iron silk road" to connect Europe to Asia.

[23] As of May 2014, there are 3 companies organizing regular container trains between Turkey and Europe: IFB, Balo and Metrans.

[24] By 16 June 2014 IFB ended direct container service to Turkey and started using vessel connection via Constanta powered by Global Multimodal.

[27] TCDD Taşımacılık acquired its entire fleet from the Turkish State Railways on 28 December 2016, when the handover between the two organizations was signed.