My Finished Drawing of Pan Am Maine Central Heritage GP9

Here is my finished drawing of the Pan Am Maine Central Heritage GP9.  After trimming the gold stripes and logos, it is important to fill the green ink as close to the lines as possible.  Do not be afraid to go back two or three times around logos and numbers and against the stripes to make the edges crisp.  As I mentioned, this eliminates the risk of the paper showing through.
I have also painted the underframe black.  It is very important when painting the locomotive to use two and often three coats of ink.  The first coat merely blocks in the green area.  The second coat begins to smooth out the brush strokes and even out patches that the first coat missed. 
Often, it is good to find a pen that is a close match but perhaps a bit lighter in color to use as a top coat.  This smooths out the paint and gives the scheme a sheen.  Before beginning to paint, test and see on a scrap of paper if the lighter top pen and the darker base coat look good together.  Do not be afraid to test many colors until you find the right match that works for your railroad.  Enjoy drawing trains.