Engine Grime - Define Engine Grime,
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Track wash - can be done with any artists oils, any colour you like.
Fresh Engine Oil - same as above, if you so wish.
Track Rust Pigment - Artists Pastel chalks, browns and oranges.
Dark Steel Pigment - grab a pencil, rub it on very fine sandpaper, apply the powder to the tracks with your finger.
Still a good set, sorta lumps everything together, I guess thats the point, but tbh untill stuff like this hits my local model shop, ie becomes available as an "impulse buy", I dont see the point, because I can just walk into my local Arts shop and buy stuff that does the same thing.
Sorry if this sounds negative, was not meant to.