An engineer stands near a sign comparing the human body to a 

An engineer stands near a sign comparing the human body to a train engine in Lagos, Nigeria, on Saturday, April 14, 2013. The Nigerian Railway Corp., while recently restarting service from Lagos to the northern city of Kano, still has relics from the past littering the grounds of its headquarters in Lagos. Historians hope to preserve some of these old locomotives and train cars for future generations to see. (AP Photo/Jon Gambrell)
Associated Press
An engineer stands near a sign comparing the human body to a train engine in Lagos, Nigeria, on Saturday, April 14, 2013. The Nigerian Railway Corp., while recently restarting service from Lagos to the northern city of Kano, still has relics from the past littering the grounds of its headquarters in Lagos. Historians hope to preserve some of these old locomotives and train cars for future generations to see. (AP Photo/Jon Gambrell)
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