(07-10) 17:00 PDT OAKLAND -- A man who lay down on the tracks in front of an Amtrak train in Oakland had limbs severed but was taken from the scene alive this afternoon, authorities said. Amtrak spokeswoman Vernae Graham said the eastbound Capitol Corridor train No. 536 was leaving Jack London Square when it struck the man at Webster Street at 3:37 p.m. The man lost some limbs and was hospitalized in critical condition, police said. Further details were not available, and the man's name has not been released.