Early morning commuters were met with a broken down train on Chiltern Railways between Saunderton and Princes Risborough.
Passengers were told at about 8.45am that trains would start running again from Oxford Parkway.
They've been stuck at the station for an hour waiting for a depature.
@BBCOxTravel @chilternrailway Oxford Parkway passengers just told first trains should start running in half hour
— Wojtek Lubowiecki (@luboxon) July 28, 2016
But Chiltern Railways has said off peak tickets at Bicester Village, Oxford Parkway, HDM and PRR can travel on earlier trains due to the inconvenience.
Due to a broken down train earlier
— Chiltern Railways (@chilternrailway) July 28, 2016
Off Peak Tickets at BAN, Bicester North/Village, Oxford parkway, HDM and PRR can travel on earlier trains
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