ALT Engineers work on one of the platforms at London Kings Cross Station in front of an engineering train full of new ballast.

ALT An engineer uses a cutter to cut through a redundant metal pipe down on the tracks at London Kings Cross Station, causing sparks to fly up.

ALT Newly laid ballast on platform nine at London Kings Cross Station with machines called wackers which are used to flatten the ballast down in the background and an engineering train on the left.

ALT Newly laid ballast on an empty platform eleven at London Kings Cross Station.

ALT A photo of a theodolite being used by engineers, with London Kings Cross Station in soft focus in the background.

ALT Various pieces of large machinery and workers work on the railway tracks outside London King’s Cross station.

ALT An engineer wearing a visor uses cutting equipment on a redundant piece of metal outside London King’s Cross station.

ALT A crane pushes a large trolley carrying metal boxes, which will hold signalling equipment once installed, along the railway track into Gasworks Tunnel at London Kings Cross