Railroad signaling
Subtitle: the block system
By: by John P. O'Donnell. To be read at the annual convention [American Society of Civil Engineers] June, 1894
Published: 1894
Place of publication: New York]
Language: eng
Number of pages: 30
Subjects: Railroads; Signaling; Block system; Blocs-systèmes
Notes: Caption title.

"Advance copy ... American Society of Civil Engineers ... Transactions [1894?]."