Canadian pipeline giant Enbridge will consider adding around 200,000 barrels per day to its oil pipeline system carrying crude to the United States once the Trans Mountain Expansion pipeline in Canada becomes operational, a senior Enbridge executive has told Reuters in an interview. Enbridge operates the Mainline pipeline network, which has the capacity to transport nearly 3 million bpd of light and heavy crude oil from Edmonton, Alberta, to the U.S. Midwest and Ontario. But the Trans Mountain Expansion project, whenever it becomes operational,…