Planetary gear train of automatic transmission for vehicle

A planetary gear train of an automatic transmission for a vehicle comprising:

• an input shaft receiving torque of an engine;
• an output shaft outputting torque;
• a first planetary gear set including a first rotation element, a second rotation element, and a third rotation element;
• a second planetary gear set including a fourth rotation element, a fifth rotation element, and a sixth rotation element;
• a third planetary gear set including a seventh rotation element, an eighth rotation element, and a ninth rotation element;
• a fourth planetary gear set including a tenth rotation element, an eleventh rotation element, and a twelfth rotation element;
• a first shaft connecting the first rotation element to the fourth rotation element;
• a second shaft connecting the second rotation element to the sixth rotation element;
• a third shaft connected to the third rotation element;
• a fourth shaft connecting the fifth rotation element to the seventh rotation element and the twelfth rotation element;
• a fifth shaft connected to the eighth rotation element, selectively connectable to at least one of the second shaft and the third shaft, and directly connected to the input shaft;
• a sixth shaft connected to the ninth rotation element;
• a seventh shaft connected to the tenth rotation element;
• and
• an eighth shaft connected to the eleventh rotation element, selectively connectable to the sixth shaft, and directly connected to the output shaft.