The Mark Twain Zephyr was an early diesel four-unit articulated zephyr train that was similar to the Pioneer Zephyr in style. The train was built by the Budd Company and was powered by a diesel engine produced by the Winton Engine Company. The train was named after the renowned author Mark Twain because it was scheduled to provide service from St. Louis, Missouri to Burlington, Iowa via Hannibal, Missouri, his hometown. The train's exterior structure used stainless steel, and had a "shovel nose" front.