Title
A Semaphore Signal on an American railroad
Caption
Illustration depicting a Semaphore Signal on an American railroad. One arm governs several tracks, the number of the track which is clearly shown on the indicator disk. The safety position was with the blade at 60 degrees in the lower quadrant. Dated 19th century
Date
19th century
Credit line
Photo12/Ann Ronan Picture Library
Reference
ARP23A18_314
License type
Rights managed
Available size
60,0Mb (9,7Mb) / 13,4in x 17,4in / 4014 x 5224 (300dpi)