Seven people died and more than 70 were injured

There will also be a private ceremony to dedicate a memorial garden that has been built next to the scene of the tragedy.

Seven people were killed and more than 70 injured when the rear coach of a West Anglia Great Northern train heading for King's Lynn in Norfolk became derailed 150 yards south of the station.

Members of the Potters Bar community, local clergy, the British Transport Police and the railway industry have put together the day's events.

The memorial garden was designed and built by landscape designer Trevor Smith, of York.

White blossom

It features a spiral path edged by large natural stone blocks that also provide a seated area.

Surrounding the seating area is a ring of ornamental pear trees selected for their attractive white blossom in April and May and providing a natural screen.

Central to the garden is a specially-commissioned sculpture by local sculptor Paul Bainbridge.

The local community has paid for the work at a cost of �8,000 money raised at a soccer match held shortly after the tragedy.

The short garden dedication ceremony will coincide with 1256 BST - the time of the crash.

During this period there will be no train movement through the station as a mark of respect and road traffic in the immediate vicinity will come to a standstill.

There will also be a service of commemoration at Mount Grace School, Church Road, Potters Bar.