"Secrets of The London Underground" U&Yesterday TV channel

I would beg to differ. Whitechapel District opened 6 October 1884 at the present site. It came to the surface because it had to pass over the East London Line as the original link to the London & Tilbury had been proposed in 1882 but abandoned. Another reason it had to be in the open was for the steam engines to stand.
The East London line station and entrance had been there since 1876 in a cutting. The District Line footbridges from the booking hall to the platforms were tacked on.

I did watch it yesterday, interesting. I also went to Aldgate East today, saw some parts of the old station sat close at window.

"A south-west to north-east tube line was proposed in 1970 by the London Transport Board's London Rail Study as the next project after the completion of the Victoria line and the Fleet line (now the Jubilee line). Designed to relieve pressure on the District, Central and Victoria lines and to link two areas without tube services, the route would have taken over the Wimbledon branch of the District as far as Parsons Green, then followed a new underground alignment via Aldwych (where it would take over the then Piccadilly line shuttle to Holborn); thence to Leytonstone, and continuing over one of the branches of the Central line. For financial reasons the line was not built, but the idea has remained." source here This would save the cost of twin tunnels from Aldwych to Holborn and cost of two platforms at Aldwych, but limit the new line here to current alignment and tunnel dimensions. Probably saving a very small share of whole project. And how would they proceed north at Holborn? At least one new platform needed there, and probably two to head towards Farringdon.

My source (Doug Rose's LU Diagrammatic History, 8th edition) shows the situation somewhat different, and it seems that St Mary's and Whitechapel were part of the same extension project. Steam services started from St Mary's to the East London Line on 1 Oct 1884, but the extension lines from Mansion House and Liverpool Street were first served from 6 Oct 1884, so later that week! The current Whitechapel was a reversing point for the District service until the extension east opened on 2 June 1902.

Last of the series yesterday.

Enjoyable, but thought they might have covered the original plan for a deep-level line from before the war on the Clapham South shelters to give it a full Tube railway context.

Good to see all that Moorgate had to offer,too-wonder if the Greathead Shield still works? And whether in 2121, there'll be similar excitement at TfL tours around the abandoned Crossrail project.

Hope we don't have to wait as long for another series, though!

I don't recall seeing much (public) info about the power supply systems, have I missed it or is there really not much out there to find?

I wondered about that with the Bull and Bush episode - was that why it was said to have been mothballed in the 1960s, despite retired members of staff having memories of it still in use for various activities until the late 1980s (though I'm not sure if the Victoria Line floodgates were ever controlled from there), or had the researchers not done their research?

The flood threat to London remained, with periodic training routines, until the Thames Barrier was commissioned in 1982. The GLC flood control was based in temporary cabins in the Holborn tram subway, just on the boundary of the predicted wet area! Why not up the Post Office Tower to be sure to be dry?

I enjoyed the series. My only complaint was that it was too short! They could have easily made a few more episodes

I believe it was considered, but the number of slip-rings required for the control circuits ruled it out!

It is only the former restaurant level which goes round and round!

tweeted few hours ago, by Tim Dunn