The investment comes in the form of roughly $90 million, which, XPO said, will go towards 770 new tractors over the course of the remainder of 2018, during which time the units will be integrated into the XPO LTL fleet. These tractors will both replace, and add to, the existing fleet, with the current total number of tractors now at approximately 8,000 in North America, according to XPO.