Preparations for thermit welding at Chilson on 13 April 1986, during a Sunday Cotswold Line engineering possession. With propane cylinders and tools loaded onto a trolley (along with the workman's lunch!), a couple of workers assemble a mould around the joint. The welding crucible can be seen on the ballast behind them. Note the complete absence of any hi-visibility clothing. Today the men would be wearing orange head to toe!