Modern yard operation 
Series: Its Bulletin 108
Publisher: Union swith & signal company
Published: 1926
Place of publication: [Swissvale, Penn.]
Language: eng
Number of pages: 91
Subjects: Railroads -- Yards.; Railroad terminals -- Illinois -- Chicago.
Other titles: Marhham yard.
Notes: Diagrams on lining-paper.
"Markham yard": p. [51]-91.