By no means a definitive list, ongoing enquiries and research to verify the colours in use past and present, those that have been identified are standard RAL Colours, available from here.
Deutsche Bundesbahn (DB) adopted a uniform colour scheme for it’s livery and Corporate presence.
For locomotives as RAL 3020 Traffic Red.
The white contrast surfaces on the locomotives have been replaced by RAL 7035 Light Gray bars.
The frame area was painted in RAL 7012 Basalt Gray.
The colours scheme for the Wangerooge Island Railway.
Coaches are RAL 1010 Pure White with RAL 5012 Light Blue band.
Roofs are either RAL 7002 Umbra Grey or RAL 9005 Jet Black.
RAL colour codes for paint schemes of German Railways.