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- système de signalisation ferroviaire utilisé en France (fr)
- signalling scheme designed to ensure the safe operation of a railway by allowing only one train to occupy a defined section of track (block) at any time (en)
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- A small wooden box with a bell on the cover (en)
- The same box with the cover removed, revealing the relay inside (en)
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- Internal view showing the coil, clapper and relay (en)
- Tyer's single stroke signalling bell (en)
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- British Railways standard block instrument. At the bottom is the tapper, bell and the commutator switch that is used to set the status of the block . Above that is the indicator of the block's status which is also seen in an adjacent signal box. At the top is a repeater display of the status of the adjacent block. (en)
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- Block Instruments-11.JPG (en)
- Block Instruments-2.JPG (en)
- Block Instruments-8.JPG (en)
- Block Instruments-9.JPG (en)
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- Absolute block signalling (en)
- Persinyalan blok absolut (in)
- Blocco Elettrico Manuale (it)
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