I think it's funny that three serials I'm reading now have much the same theme, and I have a bit of trouble keeping them straight when I get a new chapter.
We have Lumpy's Imperium series (now Sands of Saturn), somethin fishy's Medieval Marine (Repercussions) and Banadin's Cast in Time. All have a modern (or futuristic) man sent back in time and reindustrializing their society.
All three are excellent, and it only takes a second to remember where each one is in their progress.
Three different tales, and it's interesting to see how each goes about their business. I mean, if I got sent back in time, I'd know about soap & water and sanitation, but gunpowder? Making steel? I don't think I'd be much use to a pre-industrial society.