Trains are expected to be running on both the Ipswich to Felixstowe and Sudbury to Marks Tey lines from Monday.
The Sudbury branch has been running replacement bus services since November 10, while the Felixstowe branch has seen buses replace trains since November 11.
A number of diesel trains, which operate on the branch lines, have been out of action for repair works due to damage caused by leaf fall.
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