An antique signal box instrument from the Great Western Railway, built to the design originally developed by Charles Spagnoletti in the 1850s. Spagnoletti was GWRs first Telegraph Superintendent and is credited with pioneering an entirely new system of block signalling to allow more trains to be run efficiently where previously rail safety was wholly reliant on the vigilance of railway workers. His system laid the foundation for all block signalling across the British railway network.His design employed a pair of labels marked'line clear' or'train on line', triggered by a pair of electromagnets and displayed in a window at the bottom of the instrument's face. The instrument measures 29cm high x 20cm wide. Overseas buyers, including those in mainland Europe, please be aware that most international sales now attract import charges. The item "Railway Signal Box Instrument, GWR Great Western Railway, Spagnoletti" is in sale since Thursday, May 13, 2021. This item is in the category "Collectables\Transportation Collectables\Railwayana\Hardware Railwayana\Other Hardware Railwayana". The seller is "james_cumbria" and is located in Penrith, Cumbria. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Japan, New Zealand, China, Israel, Hong Kong, Norway, Indonesia, Malaysia, Singapore, South Korea, Switzerland, Taiwan, Thailand, Bangladesh, Bermuda, Guernsey, Gibraltar, Iceland, Jersey, Jordan, Liechtenstein, Sri lanka, Monaco, Maldives, Oman, Pakistan, Saudi arabia, United arab emirates, Kuwait, Qatar.