Network Rail says a derailment early this morning at Camden Road has caused extensive damage to overhead wires. It means services will not be run between Stratford and Gospel Oak until further notice. Early indications show that the line is expected to remain closed for a number of days.
In a statement, Network Rail said: "Over the coming days Network Rail engineers will be working tirelessly to reopen the railway as quickly as possible. This work will involve large pieces of plant and equipment, including a very large road crane.
"We will be keeping the local community and passengers up to date with the situation as our work progresses."