signalling block system (Q855591)
system which enables the safe and efficient operation of railways to avoid collisions between trains
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description system which enables the safe and efficient operation of railways to avoid collisions between trains

External Links
(P646) /m/0fb8xk
(P1051) 2380
(P1417) technology/block-system
(P2581) 03409560n
(P2671) /g/122_4nlv