Which country's high-speed rail network includes the YHT service? Turkey. Yüksek Hızlı Tren, usually shortened to YHT, is Turkey's national high-speed rail service.
YHT is operated by TCDD Transport, Turkey's state railway passenger operator. The first YHT route opened on 13 March 2009 between Ankara and Eskişehir. The network later expanded to connect Ankara with Istanbul, Konya, Karaman and Sivas, using purpose-built and upgraded high-speed lines.
The name is Turkish: yüksek hızlı tren means “high-speed train.” YHT is a service brand, not a train model or a separate railway company. That distinction helps prevent a common mix-up with Turkish State Railways, which owns the infrastructure while TCDD Transport operates passenger services.
Turkey's high-speed system uses electric trains supplied by several manufacturers, including Siemens Velaro trainsets. Although YHT trains can reach up to 300 km/h, commercial speeds vary by route, track conditions and stopping patterns. Turkey has continued expanding its high-speed network toward additional cities.