This photo encapsulates how temporary loading tracks are laid in the bog: First, the mound of dried peat at left is notched by a bulldozer to create a (somewhat) level path that acts as roadbed. After a turnout is installed off the mainline, the three-man track crew begins setting panels in place with a specialized crane that operates from the adjacent field. After a panel has been maneuvered into position, the ground man ensures connections are made properly while the crane returns to the track train for another panel. The third man is in the locomotive (out of sight to the left) and will re-spot the cars as work progresses.
At this moment in time, the ground man is bent over to screw in rail bolts while track layer RL3 has just picked up a panel and is beginning to move back down the line. The extra-wide tracks on the crane are necessary to distribute its weight and prevent it from sinking into the bog... which still sometimes happens anyway.