First of all, steel rails are exposed to the air for many years. In the long days of wind and sun, there will inevitably be rusting, but during the use, the train will pass through rails, and rust will rub on the wheels.The part is worn off.
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When properly maintained by a Midwest railroad contractor, a modern running track has the potential to last for almost 30 years after its construction. It may be difficult to recognize the signs of deterioration in rails because they appear to last an entire lifetime.
The weight will depend one what size of rail is used. I have seen 60 pound rail used on some branch lines. That would be 20 pounds per foot. I have also seen 130 pound rail being used on some main lines.
While modern trains won't litter the tracks with human excrement, the traditional method did just that. This is what was known as a hopper toilet. It could either be a simple hole in the floor (also known as a drop chute toilet) or a full-flush system.
In one study conducted at the BNSF Railway Hobart Railyard in Los Angeles, the California Environmental Protection Agency estimated that residents living near a railyard experienced a higher risk of carcinogen exposure.