Therefore, it is very common that rust can be observed on rail surface several months after use, and proper maintenance and inspection can ensure safe operation.
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If you look at the average rail life on the UK's mainline routes it is typically around 14 years. However that masks the fact that the sharp high speed curves may be just 2 years old at replacement yet some of the straight sections may be 40 years old.
Trains travel at high speeds and it is crucial that the track condition is maintained at all times. It's not just the tracks, however. It is important that every aspect of the railway system is maintained, especially the overhead line equipment (OLE) and also the signalling systems.
Because there are few joints, this form of track is very strong, gives a smooth ride, and needs less maintenance; trains can travel on it at higher speeds and with less friction. Welded rails are more expensive to lay than jointed tracks, but have much lower maintenance costs.
Modern track typically uses hot-rolled steel with a profile of an asymmetrical rounded I-beam. Unlike some other uses of iron and steel, railway rails are subject to very high stresses and have to be made of very high-quality steel alloy.
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.
Network Rail owns, operates and develops Britain's railway infrastructure. That's 20,000 miles of track, 30,000 bridges, tunnels and viaducts and the thousands of signals, level crossings and stations.