These are little GRF files which I have made, which don't get a page to themselves.
Purple and Mauve to Black
These two grfs replace the Purple and Mauve company colours, respectively, with a dark grey/black colour similar to TTO's "dark grey".
You can download the original grfs from 
Old Wagons New Cargos
Allows the default trains to carry newgrf cargos.
From BaNaNas, or 
All locos in all Climates
Allows all the default locomotives to be built in every climate (eg, Turner Turbo in temperate, UU37 in tropic)