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All that is known about Carl is that he was driving a shipment of Nuka-Cola Quantum to Old Olney and crashed near his destination, waiting for a tow truck, after hitting a deer. He had also been given an award from John-Caleb Bradberton himself for driving 1 million miles accident-free 12 years prior to the incident.
Interactions with the player character
Although dead for over almost 200 years, Carl has a small "interaction" with the Lone Wanderer. His skeleton can be found in Old Olney outside the Firehouse. Alongside Carl there is a note describing a crash he had while delivering the Nuka-Cola and a brief description of the whereabouts of his truck. Carl's truck contains 24 Nuka-Colas and 5 Nuka-Cola Quantums that can help with The Nuka-Cola Challenge.
Carl Wallace's remains appear only in Fallout 3.