Re-painting / Re-skining freight cars?

Newbie asking for help....
Does any one know where there is a tutorial on how to re-paint and or re-skin freight cars.
I am planning on doing some coal hoppers.
Also what type of programs would I require?
Thanks
Kevin
Does any one know where there is a tutorial on how to re-paint and or re-skin freight cars.


I am planning on doing some coal hoppers.
Also what type of programs would I require?
Thanks
Kevin