The FAA has a device for testing the strength of windshields on
airplanes. They point this thing at the windshield of the aircraft
and shoot a dead chicken at about the speed the aircraft normally
flies at it. If the windshield doesn't break, it's likely to survive
a real collision with a bird during flight.
The British had recently built a new locomotive that could pull a
train faster than any before it. They were not sure that its
windshield was strong enough so they borrowed the testing device from
the FAA, reset it to approximate the maximum speed of the locomotive,
loaded in a dead chicken, and fired. The bird went through the
windshield, broke the engineer's chair, and made a major dent in the
back wall of the engine cab.
They were quite surprised with this result, so they asked the FAA to
check the test to see if everything was done correctly. The FAA
checked everything and suggested that they might want to repeat the
test using a thawed chicken.