Contents 9 9.2.3 Structure of Mechanical Interlocking Systems .......................................................254 9.2.4 Example: British Origin Mechanical Interlocking.....................................................255 9.2.5 Example: German Type ‘Einheit’............................................................................258 9.3 Relay Interlocking ...............................................................................................263 9.3.1 Historical Development .........................................................................................263 9.3.2 System Safety in Relay Interlocking.......................................................................263 9.3.3 Design of Relay Interlocking Systems....................................................................267 9.3.4 Example: SGE 1958 (Britain) .................................................................................270 9.3.5 Example: SpDrS60 (Germany) ..............................................................................271 9.3.6 Example: UBRI (Russia) ........................................................................................276 9.4 Electronic Interlocking........................................................................................280 9.4.1 Historical Development .........................................................................................280 9.4.2 System Safety in Electronic Interlocking ................................................................281 9.4.3 Structure of Electronic Interlocking Systems..........................................................282 9.4.4 SSI (Britain) ...........................................................................................................285 9.4.5 SMILE (Japan) ......................................................................................................289 9.4.6 Simis and L90 with Derivates (German origin) .......................................................291 9.4.7 Ebilock..................................................................................................................294 9.4.8 EC-EM (Russia).....................................................................................................298 9.4.9 ACC (Italy).............................................................................................................300 9.4.10 Local-electrical Operated Point Switches (LOPS) ..................................................302 9.5 Hybrid Technologies ...........................................................................................303 9.5.1 Hybrid Mechanical and Electrical/Pneumatic/Hydraulic Forms ..............................303 9.5.2 Hybrid Relay and Electronic Forms .......................................................................305 10 Line Block Systems ........................................................................................306 10.1 Classification ......................................................................................................306 10.2 Safety Overlays for Staff Responsible Safety Systems ....................................306 10.3 Decentralised Block Systems ............................................................................307 10.3.1 Overview...............................................................................................................307 10.3.2 Token Block Systems............................................................................................308 10.3.3 Systems with Singular Unblocking upon Clearing..................................................309 10.3.4 Systems with Continuous Unblocking ...................................................................316
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