Where there is a concentration of boreholes this is where the stations will be.
Hi, usually soil investigations are conducted along the length of the route to test the soil conditions and allow engineers a better understanding of the construction techniques to be utilised. A concentration of boreholes may indicate a probable location of a station - this is not definite though. There may be other facilities that require extensive soil investigation - such as cut-and-cover sections for cross-overs or cripple sidings. Hope that answers your query.