The Met is celebrating its 150th anniversary. Passenger services on the world's first underground railway system began on 10th January 1863, in the smoke-filled cut-and-cover tunnels dug mainly by hand between Farringdon and Paddington. And today your correspondent rode that very line (well most of it anyway) in a train decorated to fit the occasion. Alas the photo I attempted to take on alighting at Farringdon is not worth reproducing as the train was already moving out at speed and my phone is isn't up to that sort of challenge. But there are plenty of examples on the net, such as this video of that same train on Youtube, so no need for another one here. As usual, thanks to District Dave for providing the link.
I began riding the Met regularly as a schoolboy in 1962, so can claim to be have been a commuter for more than one-third of the entire lifetime of this railway line. As soon as I can think of a suitable livery to don to celebrate this remarkable achievement, I shall do so.