Guys, given the current questions on the above stuff (including questions about single or double action airbrushes), may I recommend the purchase of the British Railway Modelling magazine DVD "Right Track 3 - Painting, Lining and Finishing" which came out just afore Christmas. It's all covered in there in excellent detail with some very good demonstrations. BTW, if you haven't got Parts 1 & 2, I recommend those as well. Oh, and it shows how to make your own lining transfers too.
Steve