central line speed limits

i guess about 40-50mph in the tunnels am i correct?

I believe the line speed is 45-50 mph through most sections of the Underground part.

Between Liverpool Street and St Pauls is about 20-25mph still I think.

Yeah, pretty much lol. The tunnels only just avoid the volts in the Bank of England.

Never heard this 'other story' that you mention!

The sharp curves of the tunnels east of Bank avoid the vaults. It is in the right area most certainly.

The Vaults of the Bank of England may be a factor but I thought the main reason for the tight curvature was because the Central Line was built on a budget. So to avoid paying large bills by tunneling underneath buildings the line followed the roads instead...

I don't know what the budget on the building of the line was, but I can't imagine they'd just follow the roads? All I know is it just misses the volts and that it's refered to as the 'S' bend and has a limit of 20-25mph. Quite interesting really when you look into the history of how the lines were built. Like the Circle, Hammersmith & City and Metropolitan lines around the Farringdon area was done by 'Cut and cover'

Maximum speed allowed in the tunnels sections is 65kph, or just a tad over to take into account any little overspeeds. When ATP was first put in, some tunnel sections, notably on the loop showed 100kph, though never realised as the trains were not as then souped up.

Now someone's gonna come on and tell me, or quote me as being *entirely wrong*. Well for your benefit pumpkin I am. What I've seen and what I see everyday is just a dream............"Ceiling Cat, Ceiling Cat!!!!" ..........Yes Auxy?".........."Oh there you are, get me a brown paper bag please. I feel an algorithm coming on......."............

The government gave free wayleave under the roads, whereas you would have to pay to tunnel under people's buildings.

Indeed vaults and 'volts' appear to be used to mean the same thing, despite the latter being a measure of potential difference. ;D

[pedant]The original terminus of the Central London Railway was Bank. It was extended to Liverpool Street in 1912.[/pedant]

I had written Bank, and then changed it to Liverpool Street.

I understand that a tunnel on the Watford branch was built using tube technology - as of course was part of the ELL! But what's this got to do with the Central Line?

That sharp curve in the station at Bank - was it there before the Liverpool Street extension, or did the alignment of the extension make the sharp curve necessary?

The alignment made the curve necessary. I have some maps dating from 1944 that show all of the rail tunnels and other service tunnels in the City of London. Strangely there was a more eastward route that would not have required such a severe curve.

That may be so, but my map does not include the line beyond Liverpool Street as it had not been built in 1944. Interestingly the Central station is at an angle beneath the platforms of the main line station, if as I mentioned the line had been built further to the east the underground station would have been beneath Bishopsgate and parallel to the main line platforms. The decision to extend the Central eastwards was not made until the early thirties so it could be for some other reason, possibly other tunnels or deep foundations.