The UK Government has launched a study into potential Crossrail extension that would provide faster rail services for passengers in Hertfordshire.
The move will also pave way for the redevelopment of Euston station for HS2.
In order to provide faster rail services, the government is planning to construct a new rail link to connect Old Oak Common and the West Coast Main Line.
London mayor Boris Johnson said: "Providing a new rail route into the capital for passengers from Hertfordshire will be vital for Euston to be properly redeveloped to accommodate HS2 and to maximise the delivery of new homes and jobs in London and beyond."
Crossrail services will be extended to Harrow and Wealdstone, Tring, Hemel Hempstead, Berkhamstead and Watford Junction in Hertfordshire.
Passengers travelling into London from these locations will be able to finish their journeys within 1km of a Crossrail station.
UK Transport Secretary Patrick McLoughlin said: "We are investing record amounts to build a world-class railway, so it is vital that we seize every opportunity to make the most of these once-in-a-generation schemes.
"That is why I have asked HS2 to work closely with the Crossrail sponsors to look at extending Crossrail services to key destinations in Hertfordshire.
"Not only would this be a huge boost to passengers and the local economy, it would also provide flexibility when building HS2 into Euston, making sure we create a lasting legacy for the station."
Image: Crossrail services to be extended to Hertfordshire. Photo: courtesy of UK Department for Transport.