Computer-based interlocking israilway signalinterlocking implemented withcomputers, rather than using older technologies such asrelays ormechanics.
CBIs are mostly implemented in two parts; a section that implements the safety and failsafe requirements, and a second section that implements "non-vital" controls and indications.The European Union is working towards an EU standard within this area, calledERTMS.
Different manufacturers have their own brands of CBI such as
When interfacing different brands of CBI equipment, it may be necessary to use relays of each regime, which are then hardwired from one to the other. This happens in the middle of theChannel Tunnel where French and British signalling equipment meet.
Since only some of the major signalling organisations make CBI equipment, it was agreed that to prevent other players being left out in the cold, CBI equipment would be made available to those players at cost.[citation needed]
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