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Line 1: {{Short description\|Railway signal interlocking using computers}} '''Computer-based interlocking''' is [[railway signal]] [[interlocking]] implemented with [[computer]]s, rather than using older technologies such as [[relays]] or [[mechanics]]. Line 4 ⟶ 5: 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, called [[ERTMS]]. == Brands == Line 10 ⟶ 12: * [[Solid State Interlocking\|SSI]] (Solid State Interlocking) - [[British Rail\|BR]], [[Invensys]], [[GEC-General Signal]] * [[~~Mircrolok~~Microlok II]] * [[Smartlock]] * Westlock * Germany - Alister CBI from Funkwerk IT <ref>[[Railway Gazette International]] of July 2012, page 18</ref> == Interface between different brands ==