Tweedie, M G. <br/><br/>
Modern railway signalling / 

 - London :  Blackie and Son,  1927. 
 - xi, 259 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Railway signalling<br/>Railroad safety systems<br/>Railway communication
<br/><br/><label>Dewey Class. No.: </label>625.165  / TWE