“…Identification of importance of TCIS and their subsystems through KPT could be useful for policy makers when considering Bpoints^affecting the specific KPT when implementing new or upgrading extant systems. For example, since the construction of the new railway tracks is expensive, it could be useful to know that the implementation of ERTMS could improve capacity (by removing bottlenecks) [12,34,51,71,84,114,128,131], interoperability [12,34,45,50,51,71,85,110,131], safety [6,11,12,19,44,50,51,55,71,75,79,84,85,114,125,128,131], energy efficiency [34, 84,114,131], and efficiency of operation [12,34,84,85,128,131]. Further, according to the authors' opinions, these findings can ensure recognition of interactions between KPT and particular classes of TCIS.…”