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train coupler
What’s The Principle Behind The Train Couplers Not Loosening?
Each railway carriages is connected by a pair of hooks, but the connection doesn’t look very tight and they wobble a bit. Why don’t they come apart? Why not just connect them…
Exploring the mystery of the EMU and mine car couplers: the “invisible bond” of the mechanical world
——Hardcore popular science from structure to operation In the steel-cast rail network, EMUs are speeding at a speed of 300 kilometers per hour, and heavy-load mine trains are slowly climbing the slope…