Electric train line indicators
Three early train line indicators, with arriows which moved from red to green, depending on whether a train was on that portion of track or whether it had left it
Picture No
10422869
Media ID
47550533
Size
5133px x 3556px
(5.6MB)
Credit
Mary Evans Picture Library/Onslow Auctions Limited
Source
Unattributed photograph
Date
circa 1920s
