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Bull Bridge Accident
The Bull Bridge accident was a failure of a cast-iron bridge at Bullbridge, near Ambergate in Derbyshire on 26 September 1860. As a goods train was passing over the bridge at Bullbridge, the structure failed suddenly, causing the derailment of the majority of the wagons. There were no serious casualties, but it was a warning of the fundamental weakness of many such bridges on the British rail network. The accident The accident happened on the Midland Railway between Derby and Chesterfield, on the night of 26 September 1860. With visibility only about due to fog, the train was proceeding northwards at only . It was a long train, with twenty-seven wagons loaded with salt, two loaded goods vans, and a brake van, hauled by a tender locomotive. The heavy load caused some slippage of the engine's driving wheels on the rail. Half a mile (800 m) beyond Ambergate station, the driver suddenly noticed that the engine's rear wheels were no longer on the rails. He shut off steam, stoppe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cast-iron
Cast iron is a class of iron–carbon alloys with a carbon content more than 2%. Its usefulness derives from its relatively low melting temperature. The alloy constituents affect its color when fractured: white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing. Carbon (C), ranging from 1.8 to 4 wt%, and silicon (Si), 1–3 wt%, are the main alloying elements of cast iron. Iron alloys with lower carbon content are known as steel. Cast iron tends to be brittle, except for malleable cast irons. With its relatively low melting point, good fluidity, castability, excellent machinability, resistance to deformation and wear resistance, cast irons have become an engineering material with a wide range of applications and are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
