And that is simply because no-one has actually decided how they might fit in. All sorts of weird and wonderful schemes have been proposed. Here are a few:-
1 . Divert the Clapham Junction line via the Richmond line then back past the new stations.
2 . Or perhaps the same scheme but with only one station ...
3 . Or, divert the Richmond trains via the new interchange and route Clapham Junction services similar to the above.
4 . Or; build a second station on the Clapham Junction Line with an even longer walkway ...
Then we need to consider the Dudding Hill Line. This line currently provides a freight link from Acton Wells Junction to the Midland main line at Cricklewood; ...
At present the line has not been electrified and has a 30 mph speed limit with semaphore signalling. It is lightly used for freight with a dozen trains a day in each direction. The main traffic is aggregates (including to a cement depot at Neasden) and compacted household waste from depots at Brent Cross and Dagenham to the land-fill site at Calvert in Buckinghamshire. The line is still authorised for passenger services and very occasionally, it is used for chartered passenger trains, including Pullman heritage coaches.
5 . There are (far fetched?) proposals to re-instate a passenger service over this line; which gives yet another option perhaps with the added bonus of a link to the Euston lines.
Now if Crossrail gets a link to the outer suburban services from Euston north-west to Milton Keynes and Northampton etc. ...
6 . And one on-line visionary has proposed an even more
The whole lot is "out to consultation", whatever that may mean in practice.
And a PS looking back at Part 3 (read again). In his plans for the future of all rail services in the Capital, Boris has announced that the Gospel Oak to Barking (and Riverside??) line will increase from every 15 to every 10 minutes.
The next phase vehicle-wise is the Raspberry route 6, 6A and 6B.