The launch of Chiltern Railways' new East West Rail service, planned for December, faces potential delays due to a dispute over train door operations between the operator and unions. (148 characters)
The service on the new line, run by Chiltern Railways, had been set to begin in December.
A row over who controls the train doors—drivers or guards—threatens to push back the opening. Unions like RMT and Aslef oppose driver-only operation, fearing job losses for guards.