Within the scope of the Kayaş-Yerköy High-Speed Train Project, carried out by TCDD with Doğuş İnşaat as the main contractor and Elsitel Elektromekanik as the subcontractor, a functional design document was prepared for the 154/27.5 kV transformer substations, and the design of the transformer substations was completed. In accordance with the design document submitted to the institution, the relevant transformer substations were constructed and put into operation.