Carstairs Interfaced SSI novel features: System specification (RR-STG-D-PDSSSS-FS-1)

A number of existing Route Relay Interlockings, principally in the Railtrack Scotland Zone, are suffering from wire degradation and must be replaced, although existing trackside equipment and cabling remain in a satisfactory condition. It has been proposed that a novel configuration of SSI, known as Interfaced SSI, be used. ...