A planetary gear train may include input and output shafts, first to fourth planetary gear sets respectively having first to third, fourth to sixth, seventh to ninth, and tenth to twelfth elements, a first shaft connected with the ninth element and selectively connected with the input shaft, a second shaft connected with the twelfth element and selectively connected with the input shaft, a third shaft connected with the eighth and tenth elements and the output shaft, a fourth shaft connected with the first, fifth, and eleventh elements, a fifth shaft connected with the third, sixth, and seventh elements, and a plurality of additional shafts each selectively connecting a corresponding element to a transmission housing, the corresponding element being an element of the first or second planetary gear sets that is not interconnected.