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John Dobbin, Opening of the Stockton and Darlington Railway in 1825
John Dobbin, Opening of the Stockton and Darlington Railway in 1825

The Stockton and Darlington Railway (S&DR), the world's first public railway to use steam locomotives, first operated on 27 September 1825. It initially connected collieries near Shildon with Darlington and Stockton in County Durham, north-east England. The transport of coal proved profitable, and the line was soon extended to a new port at Middlesbrough. The opening of the S&DR was seen as proof of steam railway effectiveness. While coal was hauled by steam locomotives, horses drew passenger coaches along the rails until carriages hauled by locomotives were introduced in 1833. The S&DR suffered severe financial difficulties at the end of the 1840s but the discovery of iron ore in Cleveland led to an increase in revenue. At the beginning of the 1860s it took over railways that had crossed the Pennines, but was itself taken over by the North Eastern Railway, continuing to operate independently until 1876. Much of the original route is now served by the Tees Valley line. (Full article...)

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Gypsum

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk. The Mohs scale of mineral hardness defines gypsum as hardness value 2 based on scratch hardness comparison. Other forms of gypsum include the fine-grained, lightly-tinted alabaster, used for sculpture by many cultures in history, and the translucent crystals of selenite. This specimen of gypsum originates in Carresse-Cassaber, Pyrénées-Atlantiques, France.

Photograph credit: Didier Descouens

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