Free images results:
 

Rails pictures, stock photos and images

 
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Old Semaphore Royalty Free Stock Photography
Author: Jev
Railroad Stock Photography
Author: Rbouwman
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Rack rails Stock Photo
Author: Byon35
Rails Stock Photography
Author: Siloto
Rails Stock Photography
Author: Id1974