That may be true, but I think you'll find that's further forward movement, not backward movement. I'm sure that aside from the operating principle, there are go

That may be true, but I think you'll find that's further forward movement, not backward movement. I'm sure that aside from the operating principle, there are going to be huge differences between new and old steam engines. One thing I know about, for example, is nuclear power generators. They are "steam engines", sort-of. That requires a creative interpretation of how it works, as it doesn't match at all.