Railroad Crossing Signal Light Control Box, Detroit, Toledo & Ironton Railroad, November 1926
Add to SetSummary
Automatic railroad crossing signals are controlled through an electrical relay in the railroad track. A low-voltage electric current is sent between the two rails via a series of relays like the ones in this photo. When a train approaches, the current runs through the train's metal wheels and axles instead of the relays. This "short circuit" activates the crossing signal.
Automatic railroad crossing signals are controlled through an electrical relay in the railroad track. A low-voltage electric current is sent between the two rails via a series of relays like the ones in this photo. When a train approaches, the current runs through the train's metal wheels and axles instead of the relays. This "short circuit" activates the crossing signal.
Artifact
Photographic print
Date Made
02 November 1926
Subject Date
02 November 1926
Keywords
Collection Title
On Exhibit
By Request in the Benson Ford Research Center
Object ID
64.167.548.P.833.47866
Credit
From the Collections of The Henry Ford. Gift of Ford Motor Company.
Material
Paper (Fiber product)
Linen (Material)
Technique
Gelatin silver process
Color
Black-and-white (Colors)
Dimensions
Height: 11.25 in (book)
Width: 7.875 in (book)
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