Earlier this week saw the 150th anniversary of the London Underground, when the very first train left Paddington station towards Farringdon beneath the streets of the capital. To celebrate, we’re taking a look at the best events taking place throughout the year to honour the historic milestone.

Steam and Heritage Train Outings

This Sunday, and again on the 20th of January, the Met Locomotive No. 1 will bring steam back to the underground. Pulling along the Metropolitan Railway 'Jubilee' carriage No. 353, the exciting trip is taking place to celebrate the inaugural passenger underground journey.

Tickets available are all 'standard class' and can be purchased by telephoning the London Transport Museum's booking office on 020 7565 7298. This line is open from 09:00 - 18:00.

Poster Art 150 - London Underground's Greatest Designs

Following its debut graphic commission in 1908, London Underground has developed a global reputation for commissioning fantastic poster designs. Kicking off next month and running until October 2013, Poster Art 150 at the London Transport Museum will showcase 150 of the best designs which have been selected by an independent panel.

Find out more information and how to book your tickets on the London Transport Museum's official website.

Talk: Out of Chaos

Sam Mullins will host a discussion on Monday the 25th of March that will look back at the Underground over the last fifty years. From the King's Cross fire disaster in 1987 to the terrorist attacks in 2005, the London Underground has bounced back and remained the number one form of transport in the capital.

The discussion will take place from 18.30 to 20.00 on March 25th at the Cubic Theatre. Tickets are £10, call 020 7565 7298 to book yours.

We'll leave you with a few more images of London Underground posters from days gone by...