Have you ever noticed those dark, oily looking woods under the tracks? When we take the train, our gaze is always drawn towards the distance by the shiny tracks, but we rarely lower our heads to observe these silent 'Iron Boss Followers'. They are called anti-corrosion sleepers. And what forms an interesting contrast with them is the slightly green or brown anti-corrosion wooden flooring and guardrails on your balcony or garden, which feel refreshing to the touch. Both of them come from pine wood and are known for their "anti-corrosion" reputation. The difference between them is almost the same as the gap between "veteran soldiers who have experienced gunfire" and "light eating youth in the gym".
The starting point of the story is all on pine wood. Pine wood, with its straight texture and good elasticity, is naturally a foodie - it has a well-developed resin channel and first-class ability to absorb juice. The talent in railway sleepers is precisely this, but the "food" fed to it is quite hardcore. To make railway sleepers, we need to come up with a set of techniques that can be called the "pressure cooker refining" in the wood industry: oil immersion anti-corrosion technology.
Simply put, it means first letting the processed pine sleepers lie comfortably in a huge sealed tank, and then pouring in black and shiny anti-corrosion oil. Then, increase the temperature and pressure, and forcefully push the oil deep into the wood. This is not just a perfunctory job of spraying on the surface and then handing it over. There is a reassuring indicator in the industry: the oil immersion depth often needs to reach 13 millimeters or more. This is not just about coating a layer of "oil film" on the surface of the wood, but truly embedding the oil deeply into the texture, like boiling a pot of old brine, with a taste that penetrates into the bones. When the sleepers came out of the jar, they emitted a dark luster all over.
The biggest ability of this "deep-fried dough sticks" is to be able to fight against nature on the railway subgrade for more than ten years or even decades. Wind, sun, rain, and snow are all common occurrences. Ordinary wood will rot and crack within two years, becoming a mushroom buffet. But oil immersed sleepers are not afraid. The 13 millimeter thick anti-corrosion layer blocks all moisture and fungi from the door, and also provides excellent insulation and insect resistance to the wood. When you pass the railway after the rainstorm in summer, you see water drops hanging on the sleepers, but the inside is dry, that is, oil is sneering.
Alright, turn your head again and take a look at the high-quality anti-corrosion wood in your home. It is highly likely to be pine wood, but it is taking a different route. Most of the wood is treated with carbonization, resulting in clean and slightly colored wood that can be directly painted and even maintain the original texture of pine wood. However - note this' however '- its anti-corrosion power is more concentrated on the surface. If you find a piece of scrap material to saw open, you often find that the color under the surface is lighter, and the inside is still the natural color of the wood. It offers a relatively "restrained" protection, enough to help you resist the rain on the balcony and the wet mud splashing out of the flowerpot, but if you bury it in a damp and hot hell like a railway subgrade, it will be crushed by stones and greatly shaken every day. It will probably be like a gentleman wearing an exquisite suit who accidentally enters a mud wrestling arena and cannot hold on for too long.
The black face of railway sleepers is a hardcore pass obtained with a heavy taste; The refreshing anti-corrosion wood in the courtyard is a gentle transformation for human close range living.
Speaking of which, there is no one size fits all anti-corrosion standard in this world. Some woods are destined to carry ten thousand tons of trains and eat dirt for a lifetime, while others only need to accompany their owners to drink tea on the terrace for a lifetime. They started from the same pine forest and eventually entered completely different narratives. One is responsible for hard work and the other is responsible for good looks, with clear division of labor.
