This interesting key is from the Boston & Maine Railroad. It is stamped B&MRR on one side of its bow, around the number 544. On the opposite side is stamped TAYLOR, apparently its maker.
It is steel with a nice bright finish, and is approximately 2.5 inches long -- quite short for this type of key. Rather than a door, it may have been made for a cabinet.
It does appear to have been used, as the bit edges are not sharp.
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