From memory around 22,000 people responded to TfL's consultation on Turnham Green (I think this may have been before online petitions were really a thing). Getting to 5,000 signatures may be neat but the fact that it is not too much investment of time and effort works both ways. My strong recommendation for anyone looking to get an effective campaign going on this would be to involve as many people as possible with railway and engineering experience and, as a first step, seek to understand why TfL has limited the number of stops at Acton Main Line. It may be that this points to a full service being impractical but there may be scope for a gradual increase.
Mark Evans ● 11d