Roadrailer
[ rohd-rey-ler ]
/ ˈroʊdˌreɪ lər /
Trademark.
a combination trailer truck and railroad car with two sets of retractable wheels, one steel, the other rubber, making possible bimodal transportation on rails and highways.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019