Engine gets a new paint job

Since my 10 wheeler is out of commision I decided to start painting my LGB engine from the value starter set. I painted the green cab black and also painted the tender I built black (was brown) I took off the red cow catcher and going to put a wood bumper on the front. I still need to add more detail to the engine and in the process of painting the gold bell. I still want to weather the engine. I did not have to paint the front but wondering if I should so it matches the black cab ( the front has a little more shine to it??? What is the best way to get the black weathered??? Here is what I have done so far.

Not sure if I am leaving the inside of the cab green or paint that black as well

It looks good. I’m not too experienced with weathering so can’t answer that q.

Shawn: When weathering black, I’ve always used 3 shades of grey, and two shades of iron oxide. The way I’ve done it before: Step 1) fire up the air compressor. Step 2) thin down the paints to a “wash”, 1 part paint, 2 parts thinner. Using “Q-Tips” wash the paint on, and using the compressed air, blow most of it off, pointing the air down the sides of whatever I’m working on. I set the air pressure at 25 Lbs, that way most of the wash is blown off, but it tends to collect in the knooks and crannies, right where I want it to go anyway. I usually put on one coat of each color before putting the second coat of each color. Depending upon how nasty or clean I want the piece to look will determine whether I put on thee coats or twenty coats of each color (or somewhere in between).