On Sat, 21 Oct 2006 16:06:05 +0100, Steve M wrote:

There are a few of these cross-platform interchanges across the Tube
network. From memory...

Oxford Circus (Victoria to Bakerloo, NB and SB)
Stockwell (Northern to Victoria, NB and SB)
Highbury and Islington (NR to Victoria, NB and SB)

NR as in FCC, not the NLL

Baker Street (Bakerloo to Jubilee, NB and SB)
Euston (Northern Bank Branch to Victoria, NB and SB)
Finsbury Park (Piccadilly to Victoria, NB and SB)
Barons Court (District to Piccadilly, EB and WB)
Finchley Road (Metropolitan to Jubilee, NB and SB)
Kennington (Northern Bank to Northern CX, NB and SB)
Mile End (Central to District, EB and WB)

Are there any others I've missed (excluding the obvious joint running
lines such as round the Circle)?

Off the top of my head (and stretching the definition of
cross-platform in places)...

Acton Town, Hammersmith, Wembley Park, Queen's Park (don't know if you
count these as joint running lines)
Greenford
Ealing Broadway (sort of)
High Street Kensington (Olympia shuttles to/from NB Circle/District)
Earl's Court (since you're counting Kennington)
Kensington Olympia (District to/from northbound NR only)
West Brompton (NB District to/from SB NR only)
Farringdon (WB SSL to/from EB NR, though there are a few steps)
Moorgate (WB SSL to WB NR only)
Stratford (Central to/from NR, and WB Central/NR to/from DLR)
Barking (District to/from c2c)
New Cross, New Cross Gate, Richmond, Upminster (to/from certain NR
platforms only)

That should help in compiling an exhaustive list.