The fleet is currently undergoing further examination and where necessary repair work will be carried out with the fleet out of service "for the foreseeable future." The operator says that trains' manufacturers, Siemens and CAF, have sent specialist engineers from Germany and Spain to assist with the work.

To maintain operations, Heathrow Express services are now utilising the fleet of five class 360 Desiro EMUs normally used for stopping Heathrow Connect services. These are suspended as a result with passengers encouraged to use buses or London Underground services instead.