The PP(Parallel Post) of high speed line and the SSP(Sub-Sectioning Post) of the conventional line are operating according to the its characteristics of track conditions, so the both systems are considered to be difficult in integrating into one syste...
The PP(Parallel Post) of high speed line and the SSP(Sub-Sectioning Post) of the conventional line are operating according to the its characteristics of track conditions, so the both systems are considered to be difficult in integrating into one system through the standardization.