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Southern Pacific®
coverted this 50’ box car with plexi-glass on one side
and standard solid steel on the other. It became known as the
‘Impact’ car used for freight protection instruction
- switchmen and trainmen oberved the effect of coupling whne
speeds exceed the safe limit of 4 miles per hour or more. To
demonstrate the impact, loose skids, cartons, or barrels would
be placed inside the car and a ‘handling thermometer’
measures the damage, an impact speed indicator (speedometer)
measures the coupling speed.
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