Before revision: W. Roberts, the latter being Chief Engineer for the Allegheny Portage railroad, the first crossing of the Allegheny mountains (1831–1834) Forty engineers actually appeared at the February 1839 meeting Baltimore including J. Edgar Thomson (Future Chief Engineer and later President of the Pennsylvania Railroad), Wright, Roberts, Edward Miller, and the Maryland engineers Isaac Trimble and architect Benjamin H. Latrobe and attendees from as far as Massachusetts, Illinois, and Louisiana.
After revision: W. Roberts, the latter being Chief Engineer for the Allegheny Portage railroad, the first crossing of the Allegheny mountains (1831–1834) Forty engineers actually appeared at the February 1839 meeting in Baltimore, including J. Edgar Thomson (Future Chief Engineer and later President of the Pennsylvania Railroad), Wright, Roberts, Edward Miller, and the Maryland engineers Isaac Trimble and Benjamin Henry Latrobe II and attendees from as far as Massachusetts, Illinois, and Louisiana.