A 47-year-old San Jose man was severely injured Friday night when a group of nine to 15 people robbed and attacked him at the Redwood City Caltrain station, authorities said. Late Saturday, the man remained hospitalized in critical condition, said Caltrain spokeswoman Christine Dunn. She said the man was waiting for a southbound train when he was attacked about 7:30 p.m. and then left on the ground at the station. The assailants fled before police arrived. "This is a very unusual situation," Dunn said. "We have almost 40,000 riders a day who have every reason to feel safe while riding...