Railway Signalling & Interlocking

9 Interlocking Machines 292 The basic type of Siemens is Simis, out of which different variants have been developed. Simis firstly went into operation in the 1980s. The currently most important version on the international market is Simis W, with different adaptations for different national requirements. Thales offers basically two systems: the older system L90 (Locktrac 6111), used in Germany and other countries, and the newer L90 5 (LockTrac 6151), used in different countries mainly outside Germany. L90 firstly went into operation in 1989 in Neufahrn i.NB. Also here, different adaptations have been developed for different national requirements and operational situation. System Structure In L90 and L90 5, the modules are divided by the functional levels (figure 9.34) into Interlocking Module (IM) and Field Element Controllers (FEC) (figure 9.43). In Simis (example: Simis-W, figure 9.41), in contrast, the hardware distribution is different: IIC/OMC (figure 9.42) and ACC are responsible for the interlocking functions cooperatively, with IIC/OMC being comparable with the central switching sets of a topological relay interlocking (chapter The territorial structure is that of high centralisation: A central interlocking station (including IIC/OMC in Simis and IM in L90) can be responsible for a portion of single or double line of about 50 to 100 km, whereas the area of a local interlocking station is approximately the size of a medium size station. If in Germany the electronic interlocking is included into an operation control centre, (chapter 11.5.2), the central interlocking station is called the 'sub-centre', with the CTC even one level above. Figure 9.43: System structure of L90 5 Figure 9.42: Part of Simis interlocking (Z· ywiec, Poland)