[Diary] Snow World in the night

Yesterday, it was the first heavy snow since winter. The snow was 8 cm thick. What is the forest covered by snow? I 'd like to see it.
It's dark at in the evening. I entered the beiling Park from Ximen and walked roughly toward the north gate. As usual, I don't want to walk only on the road, but walk along the trails into the woods. The sky is gray, but the ground is white. The shrubs split the cross early in the waist, and the branches stretched up. The night cast a deep and mysterious color on the woods. In the dark, branches are black, and the upper part of the branches covers a layer of snow. In the cold moonlight, the branches that stretch into the night sky are like an angry black flame that suddenly surges.
In the snow, I found a one-man-wide footprint leading to the north wall of the park. curiosity drove me along it. As expected, this is the footprint of the people who enter the park. I walked along the north wall and found that there were more than 10 "Free portals. Some of them are relatively low walls, and some are made of earth heaps or stones. The best thing is that an iron railing is broken in a hidden place and can be drilled in directly. There are also the most footprints here. If it weren't for the help of the snow, I couldn't suddenly find all the "entrances ".
When I was complacent about my findings, I suddenly found a strange point in the snow. This is a long point. It is only 2 cm wide and deep, almost completely covered by snow. Its edges are very neat and probably human, but I can't figure out what it is to make such a point. While walking along it, I thought about its source. First impression, it looks like a frog on a bicycle. Because sometimes it is one, sometimes it is two or more than four or five, they are very close, sometimes cross. However, I quickly denied this assumption. Because this trace turns left and right in the woods. In some places, the branches lie, and you need to bend over to pass. Who will keep the road and walk in the depths of the dense forest? (The reason why we say "carts" is that it is impossible to ride a bicycle in this dense forest, not to mention the thick snow) then I imagined that it could be caused by a person dragging a long and thin weight. For example, a staff member dragged steel bars or cables. However, in this case, the trace width and the edge will be blurred more or less during the turning process. However, this point keeps the edges clear and neat. So what is left by the wheel? I imagine, maybe someone is pushing the freight car on the construction site? But it must not be two wheels, because there is often only one frog mark, even if there are multiple, it is also very close. But it is not true if it is a single-wheeled car, because if it is a single-wheeled car, then people's footprints will often step on the track marks, or leave footprints on both sides of the track marks. In fact, only the footprints of people are left on the side of the point mark. I was puzzled and confused. I keep moving forward along the point mark, hoping to find its source. However, the point turned to the intersection of several trails and began to become intermittent. Later, it gradually approached the road and finally could not be identified. It seems that I could not find its secret. In short, this is a strange trace.
Later, I thought of another possibility: Maybe a staff member took a large bundle of cables and walked and put them down, in this way, the edge of the trace will not be damaged by dragging the cable. I don't know where the cable went, and why he bent in the forest.