RULES AMENDED IN BLOOD. Last October, I reminded readers of the consequences of a failure to expect a train coming on a track obscured by the train that is passing closest to you. Apparently there have been enough accidents involving people ducking behind one train only to have too close an encounter with another that on Chicago's Metra, the crews are sounding the horn as they approach the far end of a train on an adjacent track as additional warning to line-crossers waiting for that train to pass them.

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