Denver tramway corporation All carriers to have guard rails - so drivers' vision will not be blocked. 1951 Post poll says tramway service better than average, Post Ja 11 '51 p.2 Poll on increased fare. (editorial) Post 3a 12 151 p.12 City needs more buses, routes. (fourth and last in series of polls on bus service) Post Ja 12 '51 p.2 James L. Adams, executive, dies at 75. Post F 5 151 p.14