| I only build planes, so I can't really help you with the specifics. However, I endorse what "new to trains"; it depends on whether the extremities of the part would be darker or lighter in real life.
On parts with deep recesses, you might also consider a "wash". I use a smear each of black and raw umber oil paint diluted in turps to give me a fluid that looks like thin coffee. You load your brush with a little and touch it to the recess; fluid seeps along the lines, giving a deeper shadow. Wait a hour or two and wipe any excess away with cotton bud or paper towel dipped in the thinner. Some people use water colours or even coffee or tea. You can dry brush on the same part after the wash has dried. |