Why don't trains make *that* sound anymore?
Veritasium
Apr 24, 2026 13:00
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If you've been on a modern train you won't have noticed that classic "clickety-clack" sound anymore. This is because train tracks are now one continuous piece of rail without gaps.
But one long piece of metal without room to expand when hot is dangerous.
Thus, engineers had to come up with an ingenious solution involving... jagged rocks?
Education
#veritasium
#science
#physics
#rail
#railway
#tracks
#traintracks
#metal
#rock
#Robert Bunsen
#metallurgy
#Hans Goldschmidt
#chemistry
#thermite welding
#engineering
#Railroad
#train tracks
#thermal expansion
#steel
#train
#trains
#railroad
#buckling