Railroad cost performance model / 
International Bank for Reconstruction and Development 
 - Washington D.C. :  IBRD/IDA,  1970 
 - 49 p. :  ill. ;  28 cm. 
 - Economics department working paper ;  no.63 .
 - Economics department working paper (IBRD) ;  no.63 .
<br/><br/> 'February 25, 1970' 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Railroads--Cost of operation--Econometric models<br/>Transportation