wrote:
On Wed, 17 May 2017 15:17:11 +0100
Recliner wrote:
As expected, TfL has started the procurement process to replace
two-thirds of the DLR fleet (the B90, B92 and B2K sets), plus extra
stock to increase services. The 43 new generation articulated trains,
entering service from 2022, will be single 87m units, equivalent to
three of the current two-section units (which is how most DLR trains
runs now).

Why do light rail and tram vehicles seem to have a much shorter shelf life
than heavy rail trains? Is it build quality? The DLR trains seem in fairly
good nick to me, I can't see any pressing need as a passenger for them to
be replaced.

More in this:
https://www.londonreconnections.com/2017/bakerloo-deja-vu-buying-new-trains-for-the-dlr/

It seems the trains only had a 25 year design life, are used very
intensively, and do now need structural work to stay in service:
http://www.plantengineer.org.uk/plant-engineer-news/refurbishment-underway-for-docklands-light-railway/154830/