Sergio Cruz knows what early morning Caltrain commuters heading from S.F. to their jobs on the Peninsula and the South Bay want. The supersmooth conductor doesn't try to be an authority figure or hone his standup routine when he calls the stops and makes announcements. No jokes. No attitude. No shtick. Instead, he employs a soft, silky voice that somehow combines the best of Barry White and Ricardo Montalban. You'd swear there's harp music in the background when he's on the microphone. The calming delivery soothes the soul and makes the economy, the boss, and the hassles of commuting fade away.

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