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Who is the mysterious person i...

Who is the mysterious person in the picture?

Correct answers: 25

The first user who solved this task is Erkain Mahajanian.

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Pun-Dead

Making fun of dead people is a grave mistake!

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Railroad safety

In 1870, Thomas S. Hall of Stamford, Conn., received a patent for the first automatic electric block railroad signal system in the U.S. (No. 103,875). When a train entered a block of track, Hall's electromagnetic device automatically set a signal when the locomotive struck a lever fastened to the rail. The signal was set to danger until the train cleared the block. After Hall invented the device in 1867, it was tried out on the New York and Harlem Railroad.

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