Advanced train control systems 1991: proceedings of a sympo-sium june 17-19, 1991, Denver, Colorado / Transportation Re-search Board 

 - Washington : TRB 
 - 161 p. 
 - Record ; no. 1314 / Transportation Research Board .
<br/><br/> "First International Symposium on Advanced Train Control...-sponsored by the Association of American Railroads, the Rai-lway Progress Institute, and the Transportation Research Bo-ard of the National Research Council"