<b>Audio slide show:</b> Blue Line experience
They are strangers on a train. Teenage mothers pushing strollers and weary scavengers with strollers heaped with cans and bottles. Students quietly reading textbooks and proselytizers shouting passages from the Bible. The Metro Blue Line cuts across the middle of Los Angeles County from Long Beach to downtown like a surgical incision, exposing an element of the metropolis many never see.
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