Clone the Repository.
Install a working version of nmlc to the working directory.
Run compile.bat or compile.sh depending on your Operating system
Copy the resulting file to your openttd newgrf area.
Graphics/coding for Freight Wagons
Graphics for Diesel Locos
Improvements to existing graphics
More sprite variations for existing items
Coding:
Sam Bolingbroke
Grapics:
Bruce Smith
Iohane Annan
Misc:
Randall - Original Idea