Having a go at some coal wagons. Have read the articles and book but it seems to me that they make quite a meal of it. Airbrush subtle layer after layer, Careful streaks of rust or grease. So out came brush, add water to paint. Wap it on, work it round as it dried. Couple of coats of rust, coat of murky brown. Finish off with black wash. Much the same as nature really. Oh must look at photos - yep looks good.
What do others do ?
Cheers, Simon