The Advertising Standards Authority (ASA) is handling a complaint about Network Rail adverts describing Crossrail as “accessible”, despite Seven Kings station and six others having no disabled access.

Disability campaign group Transport For All alerted the watchdog over posters displayed in London reading: “When Crossrail opens in 2018/2019 it will bring you a new high frequency, convenient, accessible railway.”

Although all stations are being renovated, plans for step-free access at Seven Kings station, in High Road, were dropped in 2011.

Campaigners, residents and councillors have been fighting to get lifts reinstated ever since.

There are more than 30 steps to the platform. Stations at Manor Park, Maryland, Hanwell, Taplow, Iver and Langley will also be without lifts under current Crossrail plans.

Transport for All campaign co-ordinator Lianna Etkind said: “I don’t know what definition of ‘accessible’ they are using, but accessible to everyone who’s not disabled, not old, not carrying shopping, and not using a pushchair is not accessible in the normal sense of the word.”

If the ASA makes a ruling, the posters may be changed or removed.

A Crossrail spokesman said the “overwhelming majority of journeys” will be fully accessible and Network Rail and Transport for London are looking for opportunities to improve facilities before the new line opens.