Scores of travelers were stranded after the Acela Express 2253 took off from one platform about 3 p.m. — while they were waiting at another and unaware the train was leaving them behind. An Amtrak train bound for Washington pulled away from Penn Station on Saturday without some pretty important cargo: its passengers. ... They literally sent us to the wrong platform, and the conductor took off without any passengers,” said Damien Miano, 60, of Chelsea. “The right hand didn’t know what the left hand was doing. It was just so bizarre.” Miano said he and the other abandoned travelers...