Someone is taking the time to painstakingly etch picture perfect Autobot and Decepticon symbols on train rails in two districts of Helsinki, and the bizarre act is drawing a lot of media attention. Investigators call the quality of the work too fine to have been done on the street, which only raises further questions.

The symbols for both the evil Decepticons and their opponents, the Autobots, can be seen etched into tram rails in the Kamppi and Kluuvi districts of Helsinki.

Looking like professional work, who engraved them, when and how they got there are still all unanswered questions.

"The logos were etched either at our rail repair shop during milling or else they came that way from the supplier. The work is so finely done that no one did it there on the street," says Helsinki City Transport rail unit director Pekka Sirviö.

The Transformers began as a series of toys that has expanded into a franchise encompassing comic books, animated TV series and films.

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