DHUBRI, March 16: Altogether 15 tractors plying illegally in Dhubri district, were seized and the owners were pelized by the officials of Dhubri District Transport Office and a total fine of Rs 1,37, 000 was realized in the process over the last two days. 9 tractors were seized on Wednesday and total pelty of Rs 1,09,000 was recovered while on Thursday the department imposed pelty on another 6 tractors and collected Rs 28,000 as fine for violating the Motor Vehicle Act, an official source said.