Nice to see that the recommendations of the various communities for accessible travel have been heeded with their advice to use low thermal conductivity grab rails to assist in passengers with reduced grip strength and central nervous system function be able to hold on more easily. "cold" grab rails prevent several groups with disabilities from gripping properly. This was discussed at length for the 1972TS RVAR programme so TfL / LUL / TfL Engineering are aware of this, but it seems that yet again, nothing is being done to upset the status quo on anything that doesn't look shiny or different.
On that topic, although paint does make it look "nice" it does also, if a applied as a thick polyester coating, reduce the thermal conductivity of the grab rails, and hence make it better for these groups.
This is just one of around 50 "small change" ideas that came from a focus group in the early 2010s during the specification stages for Central and Bakerloo RVAR, and as far as I can tell, basically nothing has been taken on from it, other than perhaps the removal of tip up seats from wheelchair areas, but that was more to do with the air supply modules on 1972TS than any disability group reasons.