Close to 500 persons, including government officials, transit system operators, city planners, car builders, suppliers, and consultants, came to Boston Aug. 28-31 for a "National Conference on Light Rail Transit." Although the size of the crowd was evidence of light rail's growing popularity (RA, Aug. 8, p. 36), the conference also heard warnings about trends that could hamper the growth of light rail. Vukan R. Vuchic, professor of transportation engineering at the University of Pennsylvania, discussed some of those disturbing trends in a speech delivered at the meeting. Following are excerpts of his remarks.