The first pneumatic locomotives appeared only 15 to 20 years later than Stephenson's steam locomotive as an alternative to steam traction.
Pneumatic locomotives were widely used where smoke, sparks and steam from a much more efficient steam engine were unacceptable (on city streets and inside coal mines, during tunnel construction) at a time when electricity was not yet common as a source of energy for engines. ...
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History is cyclical, and in another round of technology - the idea of a pneumatic vehicle still excites the minds of engineers.)
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