In 1875, Paul Decauville, a French farmer, had trouble harvesting his crops due to the mud from the rainwater so he came up with a network of narrow gauge, light 60-centimetres railways with small wagons. The following years he founded a plant which manufactured these rail innovations, which were ever since known as Decauville petit trains and were used at many industrialized countries, including Greece and the Athens Gasworks. The rail tracks are still visible if one looks carefully to the ground. On these tracks, the little wagons full of coal were rolling back and forth, from the retorts to the courtyard.