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Pneumatic (compressed-air) fireless locomotives like this were often used to haul trains in mines, where steam engines posed a risk of explosion. This one is preserved H.K. Porter, Inc. No. 3290 of 1923.

空気圧工学(ニューマティクス)の仕組みと産業利用

空気圧ニューマティクス圧縮空気油圧との違い