3391. Is that quite right ; you did not mean per foot? --- No, per yard.
3392. Do you know what the tube railways in London have cost? --- Yes.
3393. How much smile have they cost? --- they vary, from the City and South London, which cost about £340,000 a mile --- that is only 10ft. 6in. In diameter --- and they went up by graduations to the Great Northern and City which cost something like £850,000 per mile.
3394. Per mile of double track? --- Per mile of double tube.
3395. The diameter was to be 16 feet --- Yes.
3396. I suppose you chose that diameter inorder that the English rolling stock would pass through it? ---Yes.
3397. I suppose you are aware that suggestions have been made to increase the loading guage of the English railways so that Continental rolling stock will pass through, and to that extent would be increased in diameter ; and to that extent whatever increase in diameter you have to make would add to the cost of your railways? --- Yes ; but I have yet to learn that there is any serious intention of putting that suggestion into operation ; because the cost of adjusting the whole of the railways in the United Kingdom would be enormous.
3398. That does not matter for the moment ; but if provision has to be made for Continental rolling stock coming over from France through Dover and then up to London and onwards you would have to increase that tube diameter? --- Yes ; it would then have to be 18ft. 6in. , which is the diameter planned for the Channel tunnel.
3399. That is to enable rolling stock constructed to what is known as the Berne quage to pass through? --- Yes.
3400. Was I right in supposing that you said that your gradients would be 1 in 29, 1 in 33, 1 in 36, and 1 in 50? --- On different sections, yes.
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