On the morning of 30 July a faulty train part-suspended the Jubilee line between Green Park and Stratford. Although investigation is still underway, it appears the problem was a fault with the Master Control Switch. This stopped the train contacting the automatic signalling system to move forward, and prevented the driver from automatically opening the doors. Once the three trains behind the faulty train cleared, it was slowly reversed to North Greenwich and placed in the middle platform to allow the service to recover. A faulty Master Control Switch is rare and Transport for London (TfL) is not anticipating further failures of this kind.
On the morning of 31 July a signal failure part-suspended the Jubilee line between Finchley Road and Waterloo. While the failure was rectified before peak service, the effects of the part-suspension were felt by customers during the peak. This was further hampered by a faulty train at Bermondsey during the morning peak, which was removed from service. The line returned to good service at 11:20. TfL sent the faulty components to the manufacturer for testing to see how similar incidents can be prevented in future.