How is it Made: Steam Locomotive - Inside A Steam Train Factory Not very green tech, but certainly the pinnacle of technology at the time, this vintage documentary shows how 90 years of experience at building steam locomotives from scratch, went into building these latest marvels in their day. Eight ton drop forges, white hot molten metal, black smithies, and moving tons of heavy metal to fit it all together with precision that is still marveled at today. Apart from the engineering itself it looked like a pretty dangerous business too.... See https://youtu.be/n3pknBx4IC0 http://bit.ly/2l0pAaL
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