A major fault on the railway track that caused misery for commuters on Monday morning will take months to permanently fix.
The problem was caused by a crack on the approach to Liverpool Street station which means trains could not access two platforms.
It led to a number of cancellations on the Great Eastern Main Line and will mean more changes to the afternoon and evening rush hour.
Engineers are working on a temporary fix but Network Rail says the replacement part will not be available until October.
Network Rail said the fault affected a specialist piece of track which is on a curve and the new part needed to be manufactured to order.
Engineers knew it would need to be replaced in the future but it has deteriorated more quickly than expected. The part was ordered earlier in the year but will still not arrive for four months.