Outside platforms

Carto Metro shows the layout at every platform on the system. cartometro.com/cartes/metro-tram-london/index.php
There are several stations (e.g. Russel Square) where the platforms are located on the outside of the formation, but there are still two separate tunnels. I think the closest LU comes to having a single deep-level tunnel with platforms on the outside of tracks is Piccadilly Circus Bakerloo line.

Nice one.

Possibly only due to their District and Metropolitan Railway influences?
Can’t think of a new-build Piccadilly station with outside platforms.

Stations like Arnos Grove and Oakwood have island platforms but a street level entrance and stairs to the platforms.

Russell Square has side platforms. The term outside platform is so foreign to me. Baker Street is stacked for both the Bakerloo and Jubilee lines to provide cross-platform interchange.

Although the Bakerloo platforms were originally alone, later joined by the new branch platforms. They were no doubt stacked, like Russell Square, to reduce the overall railway width to that of roads above, to avoid disturbing building foundations above.

A deep-level tube service, but only at sub-surface level platforms!

Aldwych station has the platforms on the outside of the tracks, and for modelling purposes has the advantage that the platforms are just long enough to fit four cars. Here's a diagram from "The Aldwych Branch":




The eastern platform (at the top of the plan) closed in 1917, but that could be ignored for modelling purposes - you could even assume both platforms would have remained open had the proposed extension beneath the river to Waterloo ever taken place, making Aldwych a through station...

If we're talking about deep tube stations with platforms opposite each other but within the same tube, then the only ones in London that could be considered to match this description are King William Street or Stockwell in their original forms. However, in both cases the platforms were either side of a single track, a bit like the current layout of Tower Gateway, and did not last very long in service (Stockwell was remodelled even before opening).

I wonder if the question is about the type of station seen on many new-build urban metros, which is basically a box with two tracks and outside platforms - and often roof supports in the gap between the tracks.

The answer to that is no - I actually pondered this last summer when visiting the Tyne & Wear metro. It struck me that whilst their north - south alignment city centre stations are basically identical to the deep level 'tube train stations' we have here in London there are some subterranean new-build stations (especially on the east-west alignment) which are of a configuration that I could not recall seeing anywhere in London.

So... whilst we in London have box-like stations with flat sides & roofs (such as Redbridge and Hatton Cross) ours here all have island platforms.

I believe the only deep tube London Underground station with platforms either side of the track within the same tunnel is North Greenwich. Even then it's a three platform station, with the central terminating track facing the eastbound platform, and sharing an island with the westbound platform.

Russell Square photos show only a single platform in each tunnel see so not double with platforms on the outside as originally sought. Platforms might be at same level as at Aldwych, but you wouldn't know to use the station. Originally Baker Street used to have only two deep-level platforms when built.

North Greenwich is a cut and cover station and it was originally intended that the platforms would be left in the open air.

It was then decided that the number of users required a roof to be put over the trench.

Water ingress has been a problem.