Special study
Subtitle: signals and operating rules as causal factors in train accidents.
By: Adopted: December 2, 1971
Series: Its Report -- no. NTSB-RSS-71-3; Report (United States. National Transportation Safety Board) -- no. NTSB-RSS-71-3
Published: 1971
Place of publication: Washington
Language: eng
Number of pages: 12
Subjects: Railroads -- Signaling; Railroad accidents; Railroads -- Safety regulations -- United States
Genres: Safety regulations