Romford is set to feature in a BBC Two series about the UK's railways.
The next five episodes of Great British Railway Journeys, presented by Michael Portillo, will air next week
Episode 17, set to air on April 29, will see the broadcaster and former MP travel from Romford to the Blackwater Estuary in Maldon.
Arriving in Romford on the Liberty Line, Mr Portillo will visit the rail operating centre near Romford station which controls the entire East Anglian rail network.
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Here, viewers will learn how signallers manage the movements of more than 4,000 trains a day and respond to emergencies on the tracks.
Chafford Gorges Nature Park, just below Upminster, will also feature in the episode, with an insight into its history as a chalk quarry and previous archaeological discoveries.
From here, Mr Portillo will then take a train through the Dengie Peninsula all the way to the River Blackwater.
The last part of the episode will see the broadcaster swap the train for the boat, with a visit to the Ross Revenge ship, home to former offshore "pirate" station Radio Caroline.
Great British Railway Journeys is now on its 16th series, with the most recent returning to screens from March 10.
Previous episodes, now available to watch on BBC iPlayer, showcased hidden gems along the UK's railway lines, in towns from Carlisle to Tunbridge Wells.
The Romford to Blackwater Estuary episode of Great British Railway Journeys will air on BBC Two at 6.30pm on April 29, and be available after on BBC iPlayer.
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