198911 – Stepniewski – An Application of SSI to Epping

Many papers have been published on the subject of the British Railways Solid State Interlocking (SSI). It is, therefore, assumed that most signal engineers have some idea of what SS1 is and its basic operation.

This paper focuses on describing the design and test process of applying SS1 to the Epping interlocking. It covers the areas of scheme design, SS1 location and circuit design, and in particular the customisation of the SS1 interlocking to the Epping requirements.