This evening's #GreatBritishRailwayJourneys will be journeying through central London and recalling the Great Smog. See Dr Carole Helfter talking to Michael Portillo about how we measure air quality in London today from BT Tower! bbc.co.uk/programmes/m00… Atmospheric Chemistry & Effects Carole Helfter

Michael hops aboard a heritage railway that runs between Epping and Ongar 🚂 Incredibly, it remained part of the London Underground until as recently as the 1990s. #GreatBritishRailwayJourneys

We're heading east on tonight’s rail adventure. Michael will begin the latest leg on the seafront at Felixstowe, and then travel to Norwich, where he traces the history of the postcode. #GreatBritishRailwayJourneys

We've reached Suffolk and Norfolk on this week's rail adventure. Take a look at some of the behind the scenes pics we've taken along the way📸 #GreatBritishRailwayJourneys

Did you see the Ipswich Tidal Barrier on Great British Railway Journeys this evening? Our officers were visited by Michael Portillo and his team to understand more about how the barrier protects thousands of homes in Ipswich. 1/2 #Ipswich #GreatBritishRailwayJourneys

This week’s exploration of post-war Britain ends tonight in the East of England. Watch at 6.30pm as Michael visits RAF Lakenheath, before heading to the city of Cambridge. #GreatBritishRailwayJourneys | RAF Lakenheath

A slice of America dropped into the British countryside. Michael visits RAF Lakenheath – a base in the heart of East Anglia where the planes and personnel belong to the US Air Force 🛩️ #GreatBritishRailwayJourneys | RAF Lakenheath

We're back this week when Michael’s route will cut through the Midlands, before turning south towards the West Country. He’ll begin in Derby, before heading to Leicester, the West Midlands, and Worcester, and ending in Bristol. #GreatBritishRailways

What will the trains of tomorrow look and feel like? 🚄 We put Michael at the controls of a new electric train to find out. #GreatBritishRailways

Tonight: There’s puppies… very, very cute ones! 😍 Don’t miss #GreatBritishRailwayJourneys on BBC Two at 6.30pm.

Tune in to Great British Railway Journeys Great British Railway Journeys on BBC Two tonight at 6.30pm 🛤️ Presenter Michael Portillo visits our National Centre, after stopping off at Leamington Spa Railway Station, and learns all about Guide Dogs and what happens at our National Centre today 🦮

Just hand that man the Oscar now! 😂 #GreatBritishRailwayJourneys

Great British Railway Journeys transmitted on Monday 17th of July where Michael Portillo comes to Wolverhampton where i share the experiences of the Windrush Generation and the impact of Enoch Powell's speech Rivers of Blood. Watch on iplayer bbc.co.uk/iplayer/episod… #Windrush75 #Windrush

Wednesday night: Michael continues to travel through England’s Midlands. In Warwickshire, he’ll get a glimpse of the work being done for the new HS2 railway infrastructure. #GreatBritishRailwayJourneys

Work on Britain's new high speed rail line, HS2, is well underway. Michael visits the section which will connect London to the West Midlands, with trains travelling at speeds up to 225mph 🚆 #GreatBritishRailwayJourneys | HS2 Ltd

Tonight: Michael travels from industrial West Midlands to the rural areas of Worcestershire and Gloucestershire. He’ll investigate pigeon-racing in Worcester, before looking into Cheltenham's popular jazz festival. #GreatBritishRailwayJourneys

Michael travels back in time on the Gloucestershire Warwickshire Steam Railway 🚂 And like many heritage railways, it owes its existence to an enthusiastic group of volunteers. #GreatBritishRailwayJourneys | Gloucestershire Warwickshire Railway

I think Michael's sat nav's gone rogue! #GreatBritishRailwayJourneys

Welcome aboard the last Concorde to be built and flown. #GreatBritishRailwayJourneys

Our series may be over, but don't forget you can catch up on all episodes right here. What were your highlights of Michael's rail journey? 🚂 #GreatBritishRailwayJourneys bbc.co.uk/programmes/b00…