Design speed is , and revenue service speed is . The power electronics uses newer technology than the HSR-350x, and the front is a new design, too. The trainsets, of which two can be coupled together, consist of two traction heads and eight articulated passenger cars, and seat 363 passengers in two classes, with enhanced comfort relative to the KTX-I. The domestic added value of the trains was increased to 87%, compared to 58% for the KTX-I. Imported parts include the pantographs, semiconductors in the power electronics, front design, couplers and final drives.