On 27 Jun, 17:11, (Neil Williams)
wrote:
Have the DLR still not worked out how to deal with that issue? *I
heard it was due to the use of tram-profile wheels on mainline-profile
rails. *If that is the case, can't they just progressively replace or
reprofile the wheelsets?

It's not as simple as that. Wheelsets are a compromise between those
which perform well on straight track and those which perform well on
curves. On mainline railways this balance is easier to strike because
curves are normally not particularly tight. However the DLR has some
extremely sharp curves, for example at West India Quay, hence the need
for suitable wheelsets. Obviously this balance has not yet been
perfected, but it's by no means an easy thing to do.