All friends who play games know that the role is drawn to the full level, and they are embarrassed to say hello to others when they go out without wearing a "limited skin" on their bodies. However, you may not expect that this principle of "looking at the face" and "looking at the equipment" can also be applied in the railway sleeper ring which seems to be full of earthy flavor.

Oiling sleepers also have their own limited skin - Obsidian black. It wasn't painted, it was poured in. And this skin is not for sale. It is purely boiled.

When the pine was just cut down, the skin was brown and the core was yellow, smelling of pine resin. At this time, it looks good, but it can't bear the burden. If you throw it in the field, it will be eaten into a sponge by insects and soaked into mud by rain in a few years. Pine also knew the outcome, so it chose to accept a remoulding transformation - into the tank, eat oil.

People on the railway call this process oiling. The name is simple, but the process is not simple at all.

After drying in the sun and removing excess moisture, the sleepers are not finished, and the real play is later.

The sleepers were pushed into a special anti-corrosion tank. As soon as the tank door was closed, the high-pressure pump began to work. Driven by pressure, the scalding oil poured into the wood from the end face, side, and notch of the wood through every hole that could be drilled in. At this time, the sleeper is like a piece of dry bread pressed into thick soup, and every cell of the body is forced to absorb. The oil penetrates all the way along the direction of the fiber to the depth of the wood - the lower limit of this depth is 13 mm.

Thirteen millimeters. This figure is a hard indicator in the sleeper industry. Shallow, the anti-corrosion effect is not good; That's enough. You can really wear that layer of obsidian black armor.

When they came out of the jar, the pine was not what it was. The whole body was shiny black, as if it had just been fished out of the asphalt River, and it sank more than one gear in its hands. Once the sun shines, the surface is suffused with a layer of oily luster. Pinch your fingernails, and you can't even leave a mark. This is the limited skin of the oiled sleepers - not the mapping, but the black directly from the bone.

The benefits of this layer of skin should be put on the railway.

The environment under the railway track is much worse than most people think. In summer, the temperature of the track bed can be up to 60 or 70 degrees. In winter, it is harder than stones, and the rain, snow and water wheels are bubbling. Ordinary wood can only survive for a few years.

The oiling sleeper is different - its Obsidian skin is essentially a layer of defense system from the inside to the outside. Water can not seep in, microorganisms can not find a foothold, and termites have to suspect that ants are born when they bite two. Even if the roots of wild grass want to plunge into wood, they must first break through the 13 mm oil immersed layer, which is about as difficult as digging cement by hand.

And the skin has its own elasticity. When the train comes over, the sleepers will slightly eat into the gravel track bed, remove some of the impact force for the rail, and then rebound to the original position. Concrete sleepers collide with each other, and the rails clatter with the wheels; The oil filled sleeper is a soft landing, with much less movement and noise.

Now high-speed rail runs everywhere, and the cement sleepers under the rails are all neat and clean. The oiling sleepers retreated to the branch line and special line, guarding those slow trucks and counting the wheels slowly. They lie on the track bed, shiny black, like a long string of silent ellipsis under the track.

Pine is worth it in my life. From an ordinary tree in the forest, I walked in an iron can, changed my Obsidian black limited skin, and then lay on the railway for 30 years. When the wind blows, the rain pours, and the train runs over, it continues.

This skin has no special lighting effect. It doesn't show the grade. You can't take it off when you put it on.

But the rail knows that the dark guy at the bottom is trustworthy.