American engineers heard about the gun and were eager to test it on the windshields of their new high-speed trains.

Arrangements were made and a gun was sent to the American engineers. 

When the gun was fired, the engineers watched in shock as the chicken hurled out of the barrel crashed into the shatterproof shield smashed it to smithereens  blasted through the control console  snapped the engineer's back-rest in two and embedded itself in the back wall of the cabin.

The horrified engineers sent Rolls Royce the film of the disastrous results of the experiment along with the designs of the windshield and begged the British scientists for suggestions

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Rolls Royce responded with a one-line memo