It shares both the main line to Ipswich and the Harwich branch with Anglia Railways express services. On all other East Essex branch lines, First Great Eastern is the sole operator.
All lines that are served by First Great Eastern are electrified (25kV AC overhead catenary) with the exception of the Marks Tey-Sudbury branch, which is served by diesels (currently on loan to Great Eastern from Anglia Railways) and occasionally by heritage steam services operated by the Steam Railway that is based at Chappel & Wakes Colne on the branch.
Branches Served: