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If Railroad A maintains its tracks well and has no accidents at all, but Railroad B neglects track maintenance and consequently has dozens of accidents, the overall statistics will reflect dozens of accidents. If, OTOH, one were to do a three-way comparison of safety between Railroad A, Railroad B, and the pipeline, Railroad A might win.

If Railroad C carries high speed passenger traffic and Railroad D only has regular speed passenger, the overall statistics would show some high speed traffic. If OTOH, one were to do a three-way comparison of speed between Railroad C, Railroad D, and the Dreamliner, Railroad A might win.

Alas, I have no statistics to back that up.
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