When you're on a train, you're most likely looking out the window or scrolling through your phone, and few people would cast their gaze at the dark, muddy wood beneath the tracks. Frankly speaking, these are probably the most "unattractive" grassroots workers in the railway system. While others are speeding along, they can only lie in the rubble and silently endure the crushing.
But if you really treat them as soft targets, you are making a big mistake. Today, let's talk about this hidden "tough guy" - anti-corrosion sleepers.
To understand its toughness, we have to start with its origin. In the sleeper circle, there is an unwritten rule that the main force is basically contracted by pine. Why choose pine? The reason is simple: it is abundant, durable, and easy to process. However, problems also arise. To put it bluntly, raw pine is like "Lin Daiyu", with fresh and tender flesh and abundant moisture. If you just chop it up and throw it in the wild, exposed to wind, sun, rain, and various insects that come to have a buffet, it will soon rot into a pile of mud.
It was obviously unrealistic to ask Lin Daiyu to do the work of Lu Zhishen. Therefore, a transformation process that could be described as "reincarnation" was staged in the processing factory.
This is not as simple as applying some sunscreen to the wood; it's a deep "infusion of internal energy". The workers placed the cut pine sleepers into a series of huge high-pressure tanks, sealed the doors, and began to evacuate the air. This step forcibly extracted the air and moisture originally hidden inside the wood, creating a vast number of "vacant rooms". Immediately afterwards, hot preservative oil was injected into the tanks, and with continuous pressure, the preservative oil was squeezed into the deep layers of the wood.
This process sounds frustrating, but once the wood has gone through it, it will ascend directly from where it was. There is a very noteworthy detail here: after this process, the oil immersion depth often reaches more than 13mm.
Don't underestimate these 13 millimeters. They are the "golden armor" that the wooden sleeper relies on for its survival. What does 13 millimeters mean? It means that no matter how severe the weather outside is, it has a thick buffer zone. Want rainwater to seep in? No way. The outer layer of oil-soaked wood is like wearing a top-notch waterproof jacket. Water droplets just slide off. Termites or other wood-eating insects come here smelling the oil, but they can only find oil in their bites and grumble and find another place to forage. Even the moisture in the air can only wait anxiously outside these 13 millimeters, unable to reach the dry core inside the wood.
After undergoing such a "baptism in oil", the pine sleepers have completely changed their appearance when they leave the factory. They are no longer the delicate wood that was afraid of water and insects in the greenhouse, but rather the worldly and slick old deep-fried dough sticks.
Lay them on the ballast, face challenges day after day, and you will understand what true "durability" means.
In the scorching summer sun, the rails are so hot they can fry eggs, yet they remain silent; even in a rainstorm, with water pouring over their heads, they don't panic. When the water recedes and the sun shines again, the moisture on their surface quickly evaporates. After shaking off the dust, they continue to carry hundreds of tons of trains roaring past. Even if they are frozen solid in winter, the oil inside them maintains the toughness of wood, preventing them from cracking. Wind, frost, rain, and snow all take turns to test them, but in the end, they have no choice but to concede.
It lies there quietly, interpreting a line from a song with its practical actions. When the strong wind carries a rainstorm crashing onto the rails, the train still passes by smoothly. If you put your ear to the rails at this moment, it seems as if you can hear it humming, "What's the pain in the wind and rain? Wipe away the tears and don't be afraid. At least we still have a 13mm oil immersion depth."
