Railway tracks are primarily made from high-carbon steel, which is a far cry from the iron rails used in the early 19th century. The standard composition in 2026 includes approximately 0.60%-0.82% carbon and 0.70%-1.00% manganese, with trace amounts of silicon, chromium, and vanadium. The carbon provides the hardness necessary to withstand the intense "axle loads" (up to 30 tons per axle) and high-speed friction, while the manganese increases the "toughness" and resistance to wear and tear. Modern rails are also subjected to heat treatment (induction hardening) to create a "head" (the top part of the rail) that is significantly harder than the "web" and "base" of the rail. This differential hardening ensures the rail is durable enough to last 20-30 years under heavy use without becoming so brittle that it snaps in extreme cold or warps in extreme heat.