Plans are in place for one final steam train to travel through the central section of the London Underground.
Details are currently limited, but the steam train will travel on the District line as part of its 150-year birthday celebrations this year. Transport for London will work with London Transport Museum to organise the trip.
The installation of new signalling as part of the Four Lines modernisation (4LM) project on the Circle, District, Hammersmith & City and Metropolitan lines means that this will be the last time it will be possible. 4LM, which will allow four more trains to run per hour (up to 32) in the central London section, is being introduced in stages and should be completed by 2023.