Signalling block system
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A signalling block system is a safety mechanism primarily found on railways that is used to prevent trains from colliding. Block systems divide the track into fixed segments using signals, sensors, or
A block instrument on the Midland Railway
Accepting a token on the South Devon Railway
Telegraph block instruments of standard British Railways design. The bell is in the bottom part with the key for sounding the bell in the next signal box. Above that is the switch for indicating whether the section of line is clear (green), there is a train in that section (red) or the normal "line blocked" state (white).
Vertical colour light signal on the Enshū Railway Line in Japan
William Fothergill Cooke
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Sir William Fothergill Cooke was an English inventor. He was, with Charles Wheatstone, the co-inventor of the Cooke-Wheatstone electrical telegraph, which was patented in May 1837. Together with John
Signalling block system
…in the Clay Cross Tunnel of the North Midland Railway. The telegraph instruments were replaced in 1841 with ones specific to block working. In 1842, William Fothergill Cooke, who had built the Clay Cross system, published Telegraphic Railways or the Single Line in which he proposed block working for general use as a safer…
William Fothergill Cooke