47852524785252 00007e8d-39f9953b 1 1 1 2 1 4785252 03035cam a22003857a 45004785252011211s1991 xxu|||||||||||100 0|eng|c0309051517ZaAdvanced train control systems, 1991 :proceedings of a symposium, June 17-19, 1991, Denver, Colorado /Transportation Research Board, National Research Council.Washington, D.C.Transportation Research Board, National Research Council,1991ix, 161 s.ill.LtvZ