Still proposed, the Crossrail 3 is shown on maps to run from Rainham to Twickenham and Wimbledon. This is the route: Rainham, Dagenham Dock, Barking, Canary Wharf, London Bridge, Waterloo, Clapham Junction, Earlsfield, Wimbledon and now the other route: Rainham, Dagenham Dock, Barking, Canary Wharf, London Bridge, Waterloo, Clapham Junction, Wandsworth Town, Putney, Barnes, Mortlake, North Sheen, Richmond and Twickenham. Wikipedia page [1] refers.