wrote in message
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"John Rowland" wrote in message
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Paul Scott wrote:

Rebuilding the 'sub surface railway' track and formation to mainline
standards throughout, so that the S stock will ride properly when
delivered.

Mainline track standards are much lower than LUL track standards: when
you have a short track and lots of tiny trains, you make the track
perfect and save money and space by having crap suspension on your
trains, whereas NR have lots of track and few trains so they build their
track out of discarded goalposts and buy proper suspension for the
trains. Hence the "Buckaroo Line" where LUL trains run on NR track.

But it's a bit worrying if the new trains need better track than the old
ones did.

Is it welded rail that they plan to lay down? That is, rails that do not
have joints for several hundred metres.

Yes - as discussed here in the past, the District renewals towards Upminster
appear to use identical rail and sleepers to recent NR track renewals - the
same 'mainline' firms are involved albeit in a Metronet led consortium.
Eventually the whole SSR is supposed to get the same treatment...

Paul S