Starting with 1881, an admission test was introduced; the top priority was the quality of candidates, the number of the selected ones being less important. Gheorghe Duca tried and succeeded to bring the best professors to the “National School of Bridges and Roads”; among these were David Emmanuel (Elementary Mathematics), Spiru Haret (Higher Algebra and Analytical Geometry), C. M. Mironescu (Statistics and Engineering Graphics), Constantin Istrati (Physics), or Anghel Saligny (Bridges and Roads). Moreover, Gheorghe Duca himself was considered the greatest authority in railways at the end of the 19th century.