ScientificAmerican1901-01-26.jpg ThumbnailsScientific American 1921-06-25ThumbnailsScientific American 1921-06-25ThumbnailsScientific American 1921-06-25ThumbnailsScientific American 1921-06-25ThumbnailsScientific American 1921-06-25
German express locomotive with auxiliary driving truck and reciprocating counterbalance