Screw-propelled railway in London, early C20?

[sampablokuper]

At some point in the last year, while browsing the Web, I read about, and saw both pictures and digitised film footage of, a railway built for an exhibition in London in the late 19th or early 20th century. The latter, as I recall.

The most unusual aspect of this railway was its method of propulsion: the carriages were propelled by a screw mounted between the tracks. Since the screw rotated at a constant rate, the speed of the carriages was controlled by the pitch of the screw: very close pitch at stations so that carriages moved slowly enough for patrons to embark or disembark; much wider between stations so that the journey was not pointlessly slow.

I thought I had bookmarked at least one web page about this railway, but now I can't find that bookmark so either I didn't bookmark it or I accidentally erased the bookmark. And nor have I had any luck with Google searches, etc.

So I'm asking for your help! Please, can anyone tell me the name of the railway, or of the exhibition, or other useful information?

Many thanks in advance!
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I seem to recall the relevant exhibition was at White City.

 

[madannie77]

Is The Never-Stop Railway at the British Empire Exhibition of 1924 at Wembley the one you are thinking of? It certainly ran on a screw mechanism.

Pathe film footage of the Never Stop Railway. It gets interesting at about 1:10 when the mechanism can be clearly seen.

 

[sampablokuper]

Is The Never-Stop Railway at the British Empire Exhibition of 1924 at Wembley the one you are thinking of? It certainly ran on a screw mechanism.

Pathe film footage of the Never Stop Railway. It gets interesting at about 1:10 when the mechanism can be clearly seen.

That's the one. Thank you!