Yerkes Tube Sections

[Deleted]

Hi All,
Does anybody know where i can find material and specifications on the Yerkes tube sections used for the tube network tunnels. Any photographs would be useful aswell.
Thanks.
Darren

[trc666]

www.dougrose.co.uk has station tiling diagrams.

[Tom]

I have it on good authority that Doug's book on tiling patterns is currently being printed. Look out for it soon, it will be about £50.

[Deleted]

Thanks Guys, but what i was actually after was the specs of the cast iron tube sections.
I gathered from my Underground Tube Stock book that the tunnel diameter is 11ft 8.5 inches from the inside of the joining flange edges but it does not say how wide each cast iron section is or how deep the flange edges are.

Is the bottom of the tunnel just filled with ballast and the track sat on it or is there some kind of jig that the rails sit on in the base of the tunnel to get the correct spacing and the ballast used as infill.

Do the sleepers line up with each tube section?

[DrJimi]

Darren - I have a copy of the cross-sectional loading gauge for tube stock, which shows dimentions and distances from the walls, etc. from which you could deduce the 'bore' and other info including rail locations. Not sure if that would help. Email me if so, and I'll mail it to you.

/Jimi

[Deleted]

cabdarren said:

Is the bottom of the tunnel just filled with ballast and the track sat on it or is there some kind of jig that the rails sit on in the base of the tunnel to get the correct spacing and the ballast used as infill.

The bottom of tube tunnels is filled with concrete. When the time comes to replace sleepers they drill out the concrete around the sleepers and then install new ones and concrete around them.

[Deleted]

Thanks for your help everyone.
Does anybody know what the minimum bend radius is for a tunnel section and do the points in the deep tube have a set turnout radius or are they made to suit.
Cheers.

[russe]

Can't help with tunnel section bend radii, but turnouts were certainly built to suit the majority of locations.

Russ

[railtechnician]

I don't know what the minimum radius of a curve is in a tube tunnel but I remember reading somewhere many years ago that check rails are fitted to curves of 22 chains radius or less and there are a few places like Knightsbridge to South kensington that fall into that category.
As for turnouts what is standard is the length of the switches and as far as I know LU uses only 'A', 'B' and 'C' switches. I seem to recall that 20s points at Kings Cross eastbound Picc have one 'A' switch and one 'B' switch which to me indicates just how tight the curve into the Kings Cross loop is.

Brian

[Deleted]

AFAIK the curve radii of the sharp bends on the Piccadilly near South Ken and Holborn are approx 5 chains/100m.

[Deleted]

railtechnician said:

As for turnouts what is standard is the length of the switches and as far as I know LU uses only 'A', 'B' and 'C' switches.

Thanks Brian. Do you know what the length is of the 'A', 'B' and 'C' switches are?

Darren.

[Tom]

railtechnician said:

As for turnouts what is standard is the length of the switches and as far as I know LU uses only 'A', 'B' and 'C' switches.

There are longer in use - usually noticable on newer sets by the supplementary detection.

White City definately has an E switch on the EB.

[mrfs42]

A, B, C, D, E defined by natural tangents? I'm sure that the PWInst. textbook makes reference to such.