"When cables are stolen it affects our signalling system, " said rail authority head Mosenngwa Mofi.
In a statement, Network Rail blamed the delay on "technical issues" that need resolving with Siemens, the company supplying the new signalling system.
BBC: NEWS | UK | England | Hampshire | Rail repairs overrun indefinitely
The Jubilee Line's planners failed to foresee the problems caused by the introduction of a novel tunnelling technique and a high-tech signalling system.
Network Rail said two fires - one near Acton and another near Heathrow - severely damaged equipment in west London, affecting its signalling system.
In June, cable thieves disabled the signalling system near Woking in Surrey, causing massive disruption for around 80, 000 South West Trains passengers in the evening rush hour.
In the most high-profile case yet, in June cable thieves disabled the signalling system near Woking in Surrey, causing massive disruption for around 80, 000 passengers in the evening rush hour.
BBC: Rail cable theft: Up to eight cases a day, MPs are told
People will begin to hear terms such as regression, microbiome, epilepsy, febrile seizures, epilepsy, signalling pathways , inflammation , immune system dysfunction , autoimmune diseases, apopotosis .
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Housing benefit will become part of the Universal Credit, signalling an end to the current system where payments are made straight to local councils or housing associations, reducing the risk of the 100, 000 social housing tenants in Wales falling into arrears.
Its goal is to map the complex network of signalling reactions which cells use as an internal messaging system, and then feed this information into other computational models.
The Japan premium, however, is today practically zero, signalling that international financiers believe that Japan's banking system will not seize up again.
It said it wanted a "traffic light" warning system for drugs - with green for those safe to take and drive, amber for caution and red signalling severe adverse effects which would dangerously impair driving.
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