It's hard to find BOTH pieces marked -- but both the lock and key of this screw-type signal box lock and key set from the Louisville & Nashville Railroad are railway marked L&NRR.
They were made by SACO (the Signal Accessories Company, formed in 1906, whose locks used a cast iron body with brass screw), and date from between 1906 and 1920. This type of lock was used to secure signals located alongside tracks.
CONDITION is extremely nice except that one panel of the triangle key has been broken away and is missing. The brass has taken on an appealing color with good patina, and the iron lock body is excellent with quality smooth casting and no rough edges.
The key will continue to work just fine, as long as you do not over-tighten the lock! It displays well with the L&N marked side up, disguising the damage on the other side.
BACKGROUND - SACO became the Railroad Accessories Company (RACO) in 1920. A few locks have RACO cast on one side and SACO on the other side. A design change held the screw captive so it would not get lost.
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