Hounslow Council has commissioned Network Rail to begin a detailed study, known as GRIP 4, on building the new train link.
The proposed West London Orbital (WLO) will on completion constitute 11 miles of routes with services between Hendon and West Hampstead to Hounslow and Kew Bridge.
Council projections predict the service will be used by more than 1,000 people in the morning peak, as soon as it opens.
However, Councillor Steve Curran, leader of Hounslow Council, said it should be noted that forecasts have consistently underestimated the use of new rail services in London.
The scheme is predicted to particularly benefit those people living in the M4 corridor, the vast majority of whom currently get around by car.
Mr Curran said modelling suggested the new line would enable a 50 per cent increase in the number of adults that can access Brentford by public transport in less than one hour.
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