Raised On Steam

I LIKE that! The surviving example's an old, old friend of mine.

I'd been doing a similar thing but with weathering power which is less precise. I initially used cotton buds dipped in IPA for streaking but they started removing the paint!

Next time I'd prefer to use paint along the rivet lines to get a similar look to your's but suspect it'd probably be easier with an airbrush. Which I don't have alas.

This is as dirty as I like my engines, used but not too flea ridden.

I love that effect you've got on the tender sides - the lines of dirt following the rivets. What method do you use to get that?