Unlike the repeater towers that are sometimes used in western states (AKA translators), SFNs aren?t simply receiving the signal, error-correcting, and retransmitting on a different frequency.

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And if a broad range of commodities are rising, far from signaling strong demand, the true signal is one of monetary error.

FORBES: The Certain Shame of the Ongoing Commodity Boom

Or you may be making a common body language error and reading too much into one nonverbal signal.

FORBES: How to Read Business Body Language Like a Pro - 3rd tip

But investigators are focused on a failure of the train tracks themselves, as opposed to an error by engineers or a failure of the train's signal system.

WSJ: Probe of Metro-North Derailment in Connecticut Focuses on Rail