Passengers will enjoy LED lighting, USB charging, a new live information system and a refurbished interior.

The Class 395 high-speed fleet travels at 140mph and connects London St Pancras International with Ashford, East Kent and Medway.

Unit 395012, which has a distinctive rainbow painted on the side, entered the train operator’s Ashford train maintenance depot on 12 June to have interior refresh work carried out, and emerged from the workshops today. It will be followed by another 28 trains over the coming months.

The revamp will also include an upgraded CCTV system and energy meters designed to help Southeastern reduce its energy and environmental impact.

This upgrade is being carried out in partnership with Hitachi Rail and Eversholt Rail.

According to a survey from Transport Focus last year, Southeastern was rated roughly in the middle for passenger satisfaction compared with other operators. C2C had the highest satisfaction rate (95 per cent), Southeastern...