Railway engineering works will be carried out at two railway stations on the Princes Risborough to Aylesbury line.
Network Rail is carrying out improvement works to prepare the way for High Speed Two (HS2) lines.
This weekend (January 28 to 29) the Princes Risborough to Aylesbury line will be closed.
Rail replacement buses will operate between Princes Risborough, Monks Risborough, Little Kimble to Aylesbury
Customers can change at Princes Risborough or Aylesbury for onward train services.
The same will happen on the weekend of Saturday, February 11 to Sunday, February 12.
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