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Rob's North York Moors Railway: The Steam Locomotive
A page describing the parts of a steam engine and explaining their operation. Thorough discussion of the parts.
National High Magnetic Field Laboratory
Magnet Academy: Steam Condensing Engine 1769
Few inventions have affected human history as much as the steam engine. Without it, there would have been no locomotives, no steamers and no Industrial Revolution.
Britain Express
Britain Express: Richard Trevithick Biography
This site by Britain Express gives a biography of inventor Richard Trevithink (1771-1833 CE).